List of Pokémon with form differences

Some Pokémon have official major variations between individuals, known as forms (Japanese: すがた form). These variations all have differing sprites in the games and are recognized by the "forms" section of the Pokédex.

Starting in, every official different form has a name given by the Pokédex, but , , and 's alternate forms were not registered in the Pokédex prior to Pokémon Omega Ruby and Alpha Sapphire. From Generation II to IV, whichever sprite is seen first will be the one displayed in the Pokédex by default; e.g., if West Sea was encountered first its sprite will appear in the Pokédex by default, whereas if East Sea Shellos was encountered first its sprite will. In, the sprite displayed in the Pokédex can be changed after interacting with Cedric Juniper in Mistralton City, even to a sprite, if it has been encountered. This option is automatically applied in. In Generation VI onwards, the sprite can be changed as long as the player has owned the Pokémon.

At times, these differences are purely cosmetic and have no bearing on the difference in the Pokémon's stats from another; however, several Pokémon differ in stats (other than HP), type, and Ability depending on their form. Among these are several and Mythical Pokémon, whose unique forms can be changed between at will and are usually spelled as Formes (Japanese: フォルム Forme).

In Pokémon Sun and Moon, regional variant Pokémon were introduced. The species of Pokémon that adapted to the environment of Alola are called Alola Forms, and have different appearances, types and abilities to Pokémon of the same species found elsewhere.

Cosplay Pikachu
Cosplay is a unique female Pikachu who has a black heart-shaped mark near the end of its tail. This unique Pikachu is able to be dressed up into different costumes corresponding to each of the five conditions (,, , , and ) and learn an exclusive move associated with that condition. Cosplay Pikachu can switch costumes anytime at any Contest Hall. It will lose the move it had with the last costume (if it still knows it), and gain the move from the new costume. If Cosplay Pikachu removes its costume while the only move it knows is the move tied to its costume, it learns.

Unlike other Pikachu, it cannot evolve or breed. Additionally, Cosplay Pikachu cannot be deposited into Pokémon Bank; instead, it can only be traded between copies of Pokémon Omega Ruby and Alpha Sapphire. Cosplay Pikachu is not present in any other games and does not register as seperate form in the Pokémon Bank Pokédex despite it registering seperately in the Pokédex of Pokémon Omega Ruby and Alpha Sapphire.

In (the only games it appears in), after the player takes part in their first, a  will give the player Cosplay Pikachu.

Pikachu in a cap
These cap-wearing Pikachu are -exclusive Pokémon that debuted in Pokémon Sun and Moon, and are being distributed in celebration of the Pokémon anime's 20th movie, and by extension, the anime's 20th anniversary. Like Ash's Pikachu, these Pikachu are always male and cannot evolve or. They also have access to the exclusive Z-Crystal, Pikashunium Z, and its Z-Move,.

Six variants exist in Sun and Moon, one for each of Ash's hats between the anime's original series and its. A seventh variant debuts in Pokémon Ultra Sun and Ultra Moon, wearing the Partner Cap, Ash's hat from the 20th movie.

Pichu
Spiky-eared is a unique female Pichu who has a tuft of hair on the end of its left ear. Spiky-eared Pichu's Pokéathlon performance stats are different than a normal Pichu's. She cannot evolve or be traded, and she cannot be transferred to the Generation V games.

In (the only games it appears in), if the player takes a  to the Ilex Forest, Spiky-eared Pichu will join the player.

The Form also appears in Super Smash Brothers Ultimate as an alternate costume for Pichu, marking it's first appearance since HeartGold or SoulSilver

Unown
has many forms, each corresponding to a typographical character. It was the first Pokémon to have multiple forms in the games. From its debut in Generation II, there are 26 forms of Unown, each corresponding to each of the twenty-six letters of the. Starting in the Generation III games, Unown has two additional forms, corresponding to the and. These forms are not interchangeable.

In, there is a special Unown Mode, an upgrade to the Pokédex that was developed by the researchers at the Ruins of Alph to record the different forms of Unown, which is available after the player has caught several Unown. In, there is the Unown Report, which is obtainable after the player completes the first tile puzzle in the Ruins of Alph.

In the Generation II games, Unown's form is determined by its s, which results in some strange phenomena; for example, in Generation II, only Unown I and V can be due to Shininess also being determined by IVs in these games. In the Generation III games, Unown's form is determined by its personality value. From the Generation IV games onward, an independent value determines the Pokémon form.

Though the form has no bearing on base stats, punctuation Unown have different performance stats to alphabetical Unown.

Castform
has four different forms, which its Ability causes it to change between in different types of weather. It is the first Pokémon to have interchangeable forms in battle in the games.

Normally, Castform is and has a plain appearance with a gray body. It takes on this form in clear weather, in any weather without a specific form, and if the weather has its effects negated by or.

In harsh sunlight, Forecast changes Castform to its Sunny Form, which is and resembles the sun. In rain, Forecast changes Castform to its Rainy Form, which is and resembles a raindrop. In, Forecast changes Castform to its Snowy Form, which is and resembles a snowy cloud. Castform reverts to its normal form when withdrawn from battle.

In Generation III and IV, if Castform's Ability is suppressed or replaced, Castform will remain in its current form (regardless of the weather). In Generation V onward, if Castform's Ability is suppressed or replaced, Castform will revert to its normal form (regardless of the weather).

Castform's stats do not change between any of these forms.

Deoxys
has four different forms which it can switch between. It was the first Pokémon whose base stats and move compatibility differed depending on its form.

In the Generation III games, Deoxys's forms are game-specific, such that it will always be in one particular form while in the player's possession (although it will be in Normal Forme in the wild).
 * In and  and, it will be in Normal Forme.
 * In, it will be in Attack Forme.
 * In, it will be in Defense Forme.
 * In, it will be in Speed Forme.

From Generation IV onward, the player can switch between its forms using meteorites found in the game.
 * In, using meteorites outside in Veilstone City.
 * In, using meteorites outside on.
 * In, using meteorites in the in Nacrene City.
 * In, using meteorites in the in Ambrette Town.
 * In, using the meteorite in Professor Cozmo's house in Fallarbor Town.
 * In and, using the meteorite next to Sophocles in the Hokulani Observatory on Mount Hokulani.

Deoxys's Normal Forme is the default form it takes, as well as the form it appears in in. In this form, its stats are more balanced, though it is notably far more offensive than it is defensive.

Deoxys's Attack Forme has higher and  than its other forms (being the non-Mega Evolved Pokémon with the highest Attack and Special Attack) and learns more offensive moves. Its and  are abysmal, much lower than its Normal Form. Its remains the same as its Normal Forme.

Deoxys's Defense Forme has much higher and  than its other forms and learns more defensive moves. Its and  are much lower than its Normal Forme, and its  is also significantly lower than its Normal Forme.

Deoxys's Speed Forme has much higher than its other forms (being the Pokémon with the highest Speed) and learns many increased priority moves.

Deoxys has the same stat in all of its forms.

Burmy and Wormadam
Both and its female evolution,, have three separate forms. Burmy can change form freely, changing its cloak depending on the environment in which it last participated in a battle (so Exp. Share alone will not change its form). Wormadam cannot change form; when a Burmy evolves into Wormadam, it retains its cloak.

Apart from and evolution, Burmy's cloak is purely cosmetic; conversely, different cloaks of Wormadam have different types, stats and learnsets. Bred Burmy will have the same cloak as the mother, will be in the same cloak as a Burmy or Wormadam bred with Ditto, or will be in Plant Cloak if bred from a and a.

If a Burmy last battled in a grassy area or water, it changes into its Plant Cloak. If female, Plant Cloak Burmy will evolve into Plant Cloak Wormadam, which is a Pokémon. This cloak is composed of leaves and twigs.

If a Burmy last battled in a sandy or rocky area, it changes into its Sandy Cloak. If female, Sandy Cloak Burmy will evolve into Sandy Cloak Wormadam, which is a Pokémon. This cloak is composed of sand and rocks.

If a Burmy last battled in a building or urban area, it changes into its Trash Cloak. If female, Trash Cloak Burmy will evolve into Trash Cloak Wormadam, which is a Pokémon. This cloak is composed of pink.

Cherrim
changes form depending on the weather. During harsh sunlight, it changes into Sunshine Form; otherwise, it is in its Overcast Form. Due to its Ability, its and  will also increase in its Sunshine Form.

In Generation IV, Cherrim changes form independently of its Ability. Starting in Generation V, it is Cherrim's Ability that changes its form.

In Japanese, the names of Cherrim's forms use 「フォルム」 form, the term otherwise only used in the names of forms localized as Forme in English.

Shellos and Gastrodon
and differ in appearance depending on where they were caught. This is purely a cosmetic difference, and these Pokémon cannot change between forms.

In Sinnoh, West Sea Shellos and Gastrodon are encountered west of Mt. Coronet, and are pink in color; East Sea Shellos and Gastrodon are encountered east of Mt. Coronet, and are blue in color. There is also a slight difference in bodily appearance depending on the form.

In other regions, only one form appears in the wild per game. In Generation VI Hoenn, Shellos appears as a, with West Sea appearing in Omega Ruby and East Sea appearing in Alpha Sapphire. Gastrodon only appears in its West Sea form in Kalos's Friend Safari. In Alola, only East Sea Shellos and Gastrodon appear in the wild.

Bred Shellos are the same form as their mother, or the same form as the Shellos or Gastrodon parent if bred with.

Rotom
has five alternate forms it can change between, in addition to its normal form. To take on these alternate forms, Rotom possesses a different, and each has its own special move. These alternate forms were introduced in.


 * When Rotom has not possessed an appliance it is
 * Heat Rotom, which has possessed a, knows and is
 * Wash Rotom, which has possessed a, knows and is
 * Frost Rotom, which has possessed a, knows and is
 * Fan Rotom, which has possessed an, knows and is
 * Mow Rotom, which has possessed a, knows and is

In Generation IV, all forms of Rotom are -type; from Generation V onward, the appliance forms replace the Ghost type with the type of their associated move. All appliance forms have the same base stats, with a higher total than that of Rotom's regular form; the only base stat of normal Rotom that is higher than its appliance forms is its Speed.

Using these locations, Rotom can also return the appliance to change back to normal form.
 * In Pokémon Platinum, the appliances are located in Rotom's Room in the Team Galactic Eterna Building, which can only be accessed by using the.
 * In, the appliances are located in Rotom's Room in Silph Co., which can be accessed when entering the broken elevator with Rotom as the walking Pokémon.
 * In, the appliances are located in boxes in the basement of Shopping Mall Nine.
 * In, the appliances are located in boxes on the second floor of the Sycamore Pokémon Lab in Lumiose City.
 * In, the appliances are located in boxes in Professor Birch's lab in Littleroot Town.
 * In and, the appliances are located in boxes in Professor Kukui's lab in Hau'oli Outskirts.

Upon changing from an appliance form, it will forget the special move associated with that appliance form. Upon changing into an appliance form, it will learn the special move associated with the form. When changing form, if Rotom knows four moves but not the special move of its previous form, the player will be prompted to replace a move with the new exclusive move (Rotom cannot change to an appliance form unless it does). If Rotom's only known move is its special move and it changes to its normal form, then the Rotom will learn. In Generation IV and, if Rotom forgets the move that is tied to its appliance form, it changes back into its normal form; in Generation VI, Rotom can remain in an appliance form even if it forgets the associated special move.

Hatched Rotom are always in normal form.

In Generation IV, Rotom changes back to its normal form when taken into the Union Room or Wi-Fi Club, or when deposited in the.

Rotom's appliance forms first appeared as silhouettes in August 2008, shortly before the Japanese release of, with a statement that indicated that these Pokémon would be in the game. Days before the game's release, it was revealed that these Pokémon were the alternate forms of Rotom. These new forms made their debut in Pokémon Platinum, and have been included in every core series game since.

Giratina
has two forms it can change between. The Origin Forme was introduced in.

In the Pokémon world, it is normally in its Altered Forme, which is a winged hexapod; in the Distortion World or while holding a Griseous Orb, it is in its Origin Forme, which is serpentine with six appendages.

The two forms have different stats and Abilities; the Origin Forme is more offense-oriented, while the Altered Forme is more defense-oriented.

Shaymin
has two forms it can change between. The Sky Forme was introduced in.

Normally, Shaymin is in its Land Forme, which is and resembles a hedgehog. When exposed to a Gracidea, Shaymin transforms into its Sky Forme, which is -type and white in color.

Sky Forme Shaymin will change back into its Land Forme at night or if it is (and cannot change into Sky Forme while either is the case); Shaymin also changes back to Land Forme when deposited in the PC (prior to Generation VII), when withdrawn from the PC (Generation VII), when deposited in Pokémon Bank, or when deposited in the Pokémon Day Care/Pokémon Nursery.

The two forms have different stats,, types, learnsets, and cries.

Arceus
has eighteen different type form variations, which correspond to the eighteen different types.

Arceus's type depends on its held Plate or type-specific Z-Crystal, becoming the same type as the type that Plate enhances or the Z-Crystal corresponds to, remaining when not holding a Plate or Z-Crystal.

While its base stats remain constant despite its changing type, its Pokéathlon performance differs. Additionally, it can learn only while holding the Draco Plate.

In the Generation IV games, there is unused data and a sprite programmed for a, but it cannot be obtained in the games as there is no ???-type Plate. This data no longer exists in Generation V due to the removal of the ??? type.

Prior to Pokémon Omega Ruby and Alpha Sapphire, Arceus's alternate forms are not registered in the Pokédex.

Basculin
has two different forms, the Red-Striped Form and the Blue-Striped Form. The Red-Striped Form has a red stripe with wide eyes and spiky fins; the Blue-Striped Form has a blue stripe with squinted eyes and smooth fins. These forms are non-interchangeable.


 * In and, red-striped Basculin can be encountered normally, while blue-striped Basculin can only be encountered by ing on or fishing in rippling water.
 * In and, blue-striped Basculin can be encountered normally, while red-striped Basculin can only be encountered by surfing on or fishing in rippling water.
 * In, blue-striped Basculin can only be encountered using a while red-striped Basculin can only be encountered using a . This order is reversed in , with red-striped Basculin requiring a Good Rod and blue-striped Basculin requiring a Super Rod.  is the exception, where only red-striped Basculin can be caught with either rod.
 * In, red-striped Basculin can be found by fishing while blue-striped Basculin must be traded for. This is reversed in , with only blue-striped Basculin being found naturally.

Bred Basculin are the same form as their mother, or the same form as the Basculin parent if bred with.

Wild red-striped Basculin have a 5% chance of holding a Deep Sea Tooth while wild blue-striped Basculin have a 5% chance of holding a Deep Sea Scale.

In Pokémon Black and White, blue-striped Basculin have the same two standard possible Abilities as red-striped Basculin— and (and are listed as such in Pokédex 3D); however, the blue-striped Basculin that can be obtained via in-game trade in Pokémon White has the Ability. In Pokémon Black 2 and White 2, wild blue-striped Basculin's two standard possible Abilities are and, while red-striped Basculin's stay the same (and are listed as such in Pokédex 3D Pro); however, blue-striped Basculin bred in Pokémon Black 2 and White 2 have Reckless and Adaptability as their two standard Abilities. When a blue-striped Basculin with Reckless is transferred from Generation V to Generation VI, its Ability is changed to Rock Head.

Darmanitan
If has  as its Ability, it changes from Standard Mode into Zen Mode when its HP drops to below half in battle. It can only remain in Zen Mode in battle.

Standard Mode Darmanitan is and red in color. Zen Mode Darmanitan is -type and blue in color.

The two forms have different stats, such that Zen Mode Darmanitan swaps the Attack and Special Attack of Standard Mode, and has higher defenses but lower Speed.

Deerling and Sawsbuck
and have four different interchangeable forms, each corresponding to a season. These forms are purely cosmetic.

In the Generation V games, Deerling and Sawsbuck will only change their form to match the current season if they are in the player's party when: the player steps outside from a cave or building such that the season changes, the player receives an from the Day-Care Man, or a saved game is loaded. All wild, bred, or NPC Trainer-owned Deerling and Sawsbuck will match the current season, with the exception of Trainers in the Battle Subway and the Pokémon World Tournament where these Pokémon are always in Spring Form.

In Generation VI, all wild and NPC Trainer-owned Deerling and Sawsbuck appear in Spring Form. Because seasons have been abandoned as a mechanic, Deerling and Sawsbuck do not change appearance, and their Summer, Autumn, and Winter forms must be transferred from a Generation V game. Bred Deerling are the same form as their mother, or the same form as the Deerling or Sawsbuck parent if bred with.

Forces of Nature
The Forces of Nature—,, and —have two interchangeable forms each.

Normally, they are in their Incarnate Forme. When exposed to a Reveal Glass, they change into their Therian Forme. Their Therian Formes were introduced in Pokémon Black 2 and White 2.

The two forms have different stats,, and cries. Even if they have their Hidden Ability, in Therian Forme each Pokémon only has one possible Ability.

In the Generation V games, they cannot be traded while in their Therian Forme.

Kyurem
, in addition to its normal form, has two other forms: White Kyurem and Black Kyurem. They are the game mascots of Pokémon Black 2 and White 2, which they were introduced in.

In the games, Kyurem changes its form through the use of the DNA Splicers, which fuses it with or. The combination retains Kyurem's Poké Ball and held item. This fusion is reversible, with Reshiram or Zekrom remaining unaltered from before being fused, including whatever item it may have been holding. The DNA Splicers can only fuse one Kyurem at a time. White Kyurem and Black Kyurem cannot be deposited into Pokémon Bank, nor can they be traded.

White Kyurem has the Ability, learns the moves and , and its cry is a combination of normal Kyurem and Reshiram's cries.

Black Kyurem has the Ability, learns the moves and , and its cry is a combination of normal Kyurem and Zekrom's cries.

Keldeo
has two interchangeable forms: Ordinary Form and Resolute Form. These forms are mostly cosmetic. The Resolute Form was introduced in Pokémon Black 2 and White 2.

If Keldeo is taught from Pokémon Black 2 and White 2 onward, it will change into Resolute Form. If it forgets Secret Sword, it returns to Ordinary Form. Keldeo taught Secret Sword in remain in Ordinary Form in other games.

Meloetta
has two interchangeable forms: Aria Forme and Pirouette Forme. Aria Forme is. Pirouette Forme is.

Normally, it is in Aria Forme, which is the only form it can take outside of battle. If Meloetta uses the move in battle, it changes between the two forms. It reverts to Aria Forme if withdrawn.

Genesect
In the games, changes forms when a Drive is attached to its back. These forms have no direct effect, although they do change the type of Genesect's signature move.


 * If no Drive is held, Techno Blast will be and Genesect will appear to have a dark yellow Drive.
 * If a Shock Drive is held, Techno Blast will be and Genesect will appear to have a light yellow Drive.
 * If a Burn Drive is held, Techno Blast will be and Genesect will appear to have a red Drive.
 * If a Chill Drive is held, Techno Blast will be and Genesect will appear to have an ice blue Drive.
 * If a Douse Drive is held, Techno Blast will be and Genesect will appear to have a blue Drive.

Prior to Pokémon Omega Ruby and Alpha Sapphire, Genesect's alternate appearances are not registered in the Pokédex.

Greninja
In the XY&Z arc of the 's, Ash's Greninja gained the ability to transform into a stronger form known as "Ash-Greninja" through an occurrence known as the Bond Phenomenon. In the games, a with the Ability  will transform into Ash-Greninja after it causes an opponent to faint. In this form, the move will become more powerful and always hit 3 times. Greninja will stay in this form until the end of battle or it faints. A with Battle Bond can be transferred to Pokémon Sun and Moon from the Special Demo Version.

Internally, normal Greninja with Battle Bond are considered a separate form than that of Greninja with or. These Greninja are always male and cannot.

Vivillon
has 18 different distinct patterns depending on the set geographic location of the Nintendo 3DS system on which the was generated (for s, this means the game in which the Egg was created). This form cannot be changed. The pattern of Vivillon encountered within a game is set when the save file is created.

Bred will evolve into  with the same pattern as that of the breeding player's game, regardless of its parents.

Note that Vivillon's pattern depends on the set geographic location of the Nintendo 3DS system when the save file was created. Locations within a country can have a different form than merely selecting a country without setting a specific location.


 * Archipelago Pattern Vivillon can be found in Puerto Rico, Anguilla, the Dominican Republic and the Yucatán region of Mexico.
 * Continental Pattern Vivillon can be found in Denmark, Germany and South Korea.
 * Elegant Pattern Vivillon is found in most areas of Japan.
 * Garden Pattern Vivillon can be found in the United Kingdom and New Zealand.
 * High Plains Pattern Vivillon is found in the Western United States, although some players in Colorado report finding the Continental Pattern instead. The High Plains Pattern also appears in the British Columbia province of Canada.
 * Icy Snow Pattern Vivillon has been reported in far northern regions of Norway and Russia, as well as Canada's Northwest and Yukon Territories.
 * Jungle Pattern Vivillon has been reported in Malaysia, Colombia, and Singapore.
 * Marine Pattern Vivillon has been reported in large areas of Spain, Portugal, and Italy.
 * Meadow Pattern Vivillon is known to be found in large sections of France and in Catalonia (Spain).
 * Modern Pattern Vivillon has been found in central and southeastern United States.
 * Monsoon Pattern Vivillon is known to come from India, Hong Kong, Okinawa, and Taiwan.
 * Ocean Pattern Vivillon comes from Hawaii and Réunion.
 * Polar Pattern Vivillon is known to come from Alaska, the northeastern United States, and large sections of Canada. Swedish players report finding Polar Pattern Vivillon as well.
 * River Pattern Vivillon has been found in most regions of Australia, the Canary Islands (Spain) and several African countries.
 * Sandstorm Pattern Vivillon is found throughout the Middle East.
 * Savanna Pattern Vivillon is known to come from Brazil, Paraguay and Bolivia.
 * Sun Pattern Vivillon has been reported throughout Latin America and the Northern Territory of Australia.
 * Tundra Pattern Vivillon has been found in Hokkaido, Norway, and Iceland.

There are also two -exclusive patterns, the Poké Ball Pattern and the Fancy Pattern. The Poké Ball Pattern resembles a standard, and was first distributed in Paris, France to promote the temporary store. The Fancy Pattern was distributed via the Nintendo Network from July 8 to 31, 2014 to celebrate the GTS's 100 millionth Pokémon trade.

Flabébé, Floette, and Florges
,, and can hold five different-colored flowers: red, yellow, orange, blue, and white. The flower color is maintained through evolution and cannot be changed.

In, Flabébé appear in the wild in , with the colors of Flabébé's flower available depending on the flower patch (although each flower patch has multiple Flabébé flower colors). In, wild Flabébé appear in Alola's three meadows, with the color of wild Flabébé's flowers depending on the meadow's flowers' color (Yellow Flower in Melemele Meadow, Red Flower in Ula'ula Meadow, Blue Flower in Poni Meadow); Orange and White Flower Flabébé exclusively appear as allies called in an SOS Battle, and can be called by any Flabébé regardless of location.

Bred Flabébé have the same color flower as their mother, or the same form as the Flabébé, Floette, and Florges parent if bred with.

In Generation VI, since only Blue Flower, Red Flower, and Yellow Flower Floette can appear in the Friend Safari, only these forms of Flabébé, Floette and Florges can have their Hidden Ability. In Generation VII, all forms of the Flabébé evolutionary line can have their Hidden Ability.

In the storyline of, there is also a unique Floette who AZ befriended 3,000 years ago. The flower it wields has a different design than normal, resembling the structure of the ancient ultimate weapon constructed by AZ; the flower also has a blue, red, and white color instead of green, yellow, and white, reflecting the colors of the. The Generation VI and games include unused data for a trainable unique Floette. Unlike the other forms, it can learn the move, and is the only Pokémon able to do so.

Furfrou
can be groomed into one of ten different trims. These trims only last for five days after being groomed. Furfrou will also lose its trim when it is deposited in the PC (prior to Generation VII), withdrawn from the PC (Generation VII), deposited in Pokémon Bank, or deposited in the Pokémon Day Care/Pokémon Nursery.

The location at which Furfrou can be groomed differs between games.
 * In, Furfrou can be groomed at in Lumiose City for 500. The player gains access to more trims as they become more stylish.
 * In, Furfrou can be groomed at the Pokémon Fan Club in Slateport City for 500.
 * In and, for 500 Furfrou can be groomed by a  at Malie City's salon or a  at Hau'oli City's salon.

Prior to Pokémon Omega Ruby and Alpha Sapphire, Furfrou's trims are not registered in the Pokédex.

Aegislash
, due to its Ability, can change forms in battle depending on the move it uses. Initially in Shield Forme, using a damaging move will change it to Blade Forme, while using will change it back into Shield Forme. Outside of battle it is always in Shield Forme.

Shield Forme Aegislash has high and, while Blade Forme Aegislash has high  and.

Pumpkaboo and Gourgeist
and can be of Small, Average, Large and Super Size. Larger sizes of Pumpkaboo are rarer to encounter in the wild.

Different sizes have different base stats. For Pumpkaboo, with each increase in size, its base HP stat increases by 5 points while its base Speed stat decreases by 5 points. For Gourgeist, with each increase in size, its base HP stat increases by 10 points and its base Attack stat increases by 5 points while its base Speed stat decreases by 15 points. Consequently, the base stat total of a Pumpkaboo or Gourgeist does not vary with size.

Bred Pumpkaboo are the same size as their mother, or the same form as the Pumpkaboo or Gourgeist parent if bred with.

Wild Super Size Pumpkaboo will always hold a, whereas other sizes will never hold an item in the wild. Super Size variants have different, lower pitched cries than the other forms.

Only Average Size and Super Size Pumpkaboo and Gourgeist can have their Hidden Ability. Average Size can be obtained with its Hidden Ability from the Friend Safari; Super Size could be obtained with its Hidden Ability from s.

The different sizes of Pumpkaboo and Gourgeist do not use different menu sprites.

Xerneas
has two forms: Neutral Mode and Active Mode. There is no gameplay difference between them; Xerneas appears in Active Mode in battle, and appears in Neutral Mode in situations outside of battle, such as cutscenes, the Pokédex, the Pokémon screen, and Pokémon-Amie. According to the Pokédex, Xerneas shares everlasting life while it is in Active Mode.

Xerneas's horns and some highlights in its fur are light blue in Neutral Mode and light gold in Active Mode. In Active Mode, the protrusions on its horns as well as its back spots light up in several colors.

Zygarde
has three different Formes, as well as two distinct constituent parts. The 50% Forme debuted in Pokémon X and Y. The other two Formes and both constituent parts debuted in the during the  arc of the, and made their core series debut in Pokémon Sun and Moon.

A Zygarde Cell is a single cell of Zygarde. They can be found scattered throughout the region. They do not have thoughts or will, and can communicate with Zygarde Cores via telepathy. They are incapable of performing moves.

A Zygarde Core is a "brain" of Zygarde. They can communicate with Zygarde Cells and other Cores via telepathy. They take action when the region's ecosystem is threatened.

Zygarde 10% Forme is a Zygarde with 10% of its cells. It has razor-sharp teeth, and can reach speeds up to 60 mph (100 km/h). It can change into Complete Forme with its Ability.

Zygarde 50% Forme is a Zygarde with 50% of its cells. It watches over and maintains the local ecosystem. It can change into Complete Forme with its Ability.

In battle, a Zygarde with the Ability will change into Complete Forme when its HP falls below half in a battle.

Zygarde Complete Forme is a Zygarde with 100% of its cells. Zygarde only takes on this form when the ecosystem is under threat and it believes Zygarde 50% Forme is unable to deal with it. Its power is said to exceed that of and.

In Pokémon Sun, Moon, Ultra Sun, and Ultra Moon, the Aether Base on on Ula'ula Island contains a Reassembly Unit, which can be used to create Zygarde 10% Forme and Zygarde 50% Forme from Zygarde Cells and Cores in the player's Zygarde Cube, or disassemble Zygarde with Aura Break back into Cells and Cores (Zygarde with Power Construct cannot be separated).

The player can create any number of Zygarde using the Reassembly Unit as long they have enough Cores and Cells. A Zygarde 10% Forme with Aura Break can be assembled with 10 Cells and Cores, a Zygarde 50% Forme with Aura Break can be assembled with 50 Cells and Cores, and a Zygarde 50% Forme with Power Construct can be assembled with 100 Cells and Cores. The Zygarde Cube can be used to change a Zygarde with Power Construct between 10% Forme and 50% Forme; Zygarde with Aura Break cannot change forms.

While only 100 Cells and Cores are normally available in one save file, the player can obtain more by separating Zygarde with Aura Break from other games. A Zygarde separated into Cells will be lost forever.

In Pokémon Sun and Moon, the player can collect Zygarde Cells and Cores in the overworld throughout the Alola region after obtaining the Zygarde Cube. There are a total of 5 Cores and 95 Cells throughout the region.

In Pokémon Ultra Sun and Ultra Moon, the player can catch a wild Zygarde 50% Forme in Resolution Cave on Poni Island; after the player catches this Zygarde, Dexio will battle the player on, and upon being defeated he will give the player the Zygarde Cube (containing 40 Zygarde Cells) and Zygarde 10% Forme.

Hoopa
has two Formes it can change between, using the Prison Bottle to temporarily change to its more powerful Forme.

Normally, Hoopa Confined is the Forme taken by Hoopa, which is. When exposed to a Prison Bottle, Hoopa transforms into Hoopa Unbound, which is. Hoopa Unbound was introduced in.

Hoopa Unbound will change back into Hoopa Confined after three days have passed since using the Prison Bottle; Hoopa also changes back to Hoopa Confined when deposited in the PC (prior to Generation VII), when withdrawn from the PC (Generation VII), when deposited in Pokémon Bank, or when deposited in the Pokémon Day Care/Pokémon Nursery.

The two forms have different stats, types, learnsets, and cries. Unlike other Pokémon with form differences, Hoopa has more than one category.

Oricorio
has four distinct styles. Depending on which island the player is on, the form that is encountered will be different. Baile Style is only found on Ula'ula Island, Pom-Pom Style on Melemele Island, Pa'u Style on Akala Island, and Sensu Style on Poni Island. Oricorio can manually change forms by sipping the nectar of certain flowers. Each of Oricorio's four styles has a different primary type; Oricorio's signature move changes type to match the user's primary type.

The forms have different types and cries.

Lycanroc
has three forms: Midday Form, Midnight Form, and Dusk Form. In and,  will only evolve into Midday Form Lycanroc, while in  and , Rockruff will only evolve into Midnight Form Lycanroc. Both Midday Form and Midnight Form can be caught in the wild in both Pokémon Sun and Pokémon Moon.

Dusk Form debuted in Pokémon Ultra Sun and Ultra Moon; only special -exclusive Rockruff with the Ability can evolve into Dusk Form Lycanroc. Own Tempo Rockruff and Dusk Form Lycanroc can breed to produce more Own Tempo Rockruff.

Lycanroc's Forms have different stats,, learnsets, and cries.

Wishiwashi
can change forms using its Ability if it is at least level 20. It will change from Solo Form to School Form at the start of a battle or at the end of a turn if its is above 25% of its maximum HP. In School Form, Wishiwashi's appearance changes from a small fish into a larger fish consisting of multiple smaller fish. It will change back to Solo Form if its HP is below 25% of its maximum HP at the end of a turn.

The two forms have different stats and cries.

Silvally
has eighteen different forms, which correspond to the eighteen types. Silvally's type and appearance will change depending on its held memory.

Minior
has two forms that it changes between with its Ability,. It will change from Core Form to Meteor Form at the start of a battle or at the end of a turn if its is above 50% of its maximum HP. If its HP falls below 50% of its maximum HP, its shell breaks and it changes back to Core Form at the end of that turn. Outside of battle, Minior is always in Core Form. However, wild Minior are always encountered in Meteor Form.

Meteor Form and Core Form have different stats. Due to its Ability Shields Down, Meteor Form Minior cannot be afflicted by status conditions.

A Minior's Core Form can be one of seven different colors. Bred Minior will always have the same Core color as their parent.

Mimikyu
has two forms called Disguised Form and Busted Form. When a Mimikyu in Disguised Form that has the Ability is hit by a damaging attack, it does not take damage and instead transforms into Busted Form. In Busted Form, its disguise slumps to the side and it can be damaged by normal means. Mimikyu will stay in Busted Form until either it faints or the battle ends.

Necrozma
has three additional forms; Dusk Mane Necrozma, Dawn Wings Necrozma, and Ultra Necrozma. All three forms were introduced in Pokémon Ultra Sun and Ultra Moon.

Dusk Mane Necrozma is the form it attains from absorbing Solgaleo. The player can induce this fusion with the N-Solarizer. After fusing, Necrozma will attempt to learn, and can use Solgaleo's exclusive Z-Move,. Its cry is a combination of normal Necrozma and Solgaleo's cries.

Dawn Wings Necrozma is the form it attains from absorbing Lunala. The player can induce this fusion with the N-Lunarizer. After fusing, Necrozma will attempt to learn, and can use Lunala's exclusive Z-Move,. Its cry is a combination of normal Necrozma and Lunala's cries.

Ultra Necrozma is a third form Necrozma can only enter in as one of the previous two forms. While holding its exclusive Z-Crystal, Ultranecrozium Z, the player can use the Ultra Burst command from the move menu to transform into Ultra Necrozma. Once transformed, Ultra Necrozma can also use Ultranecrozium Z and to use its exclusive Z-Move,.

Magearna
has an alternate form called Original Color Magearna. The only difference between Magearna's forms is aesthetic: the Original Color form is red and gold. The Original Color form cannot be legitimately obtained, and has only appeared in an official capacity in the, Volcanion and the Mechanical Marvel.

Form-like transformations
Some Pokémon have transformations that may resemble forms and have official names, but they do not register as discrete forms in the Pokédex.

Reshiram, Zekrom, and Kyurem
,, White Kyurem, and Black Kyurem enter Overdrive mode when their emotions surge, lighting parts of their bodies in flames or electricity in the process. Reshiram and Zekrom enter Overdrive mode when using their signature moves ( and for Reshiram,  and  for Zekrom) and are usually not in Overdrive mode otherwise. Black and White Kyurem, however, are always in Overdrive mode in battle.

Solgaleo and Lunala
and enter special phases when using their powers, shining brighter than normal. Solgaleo's phase is called the Radiant Sun phase, while Lunala's is the Full Moon phase. They both enter this phase while in Ultra Space (although not while in battle) or when using their signature moves. For Solgaleo, these moves are and ; for Lunala, these are  and.

Marshadow
When attacks or becomes worked up, the flames on its body flare green. This transformation is called Zenith Marshadow.

Pokémon Shuffle
In Pokémon Shuffle, Pokémon with different forms have different Skills and can have different Attack Powers and max levels.

Most Pokémon with forms in the core series games also have those forms in Pokémon Shuffle. Many Pokémon have a "Winking" form, notably including most of the starter Pokémon. There are also a few Pokémon with a "Spooky" or "Holiday" form. Pikachu has a large variety of forms, mostly unique to Pokémon Shuffle.

Pokémon GO
The alternate forms of Squirtle and Pikachu are referred to as Event Pokémon.

Squirtle
For the July 8th Pokémon GO Community Day, a special Squirtle Squad variation of Squirtle could be caught. This Squirtle can also evolve into Wartortle and Blastoise variations.

Pikachu
In Pokémon GO, Pikachu has several different forms. These Pikachu forms appear during limited event periods where Pikachu usually spawns at an increased rate globally. These Pikachu may have special moves. Pichu and Raichu can also be found in these forms.

Unown
During certain conventions or other events, specific letters of Unown may be made available at a greatly increased rate in the vicinity of the event. The letters made available relate to the event. The following Unown have been available:
 * Chicago GO Fest event - C, H, I, A, G, O (for Chicago)
 * European Safari Zone event - E, U, R, O, P (for Europe)
 * Pokémon GO Park and Stadium events - Y, O, K, H, A, M (for Yokohama)
 * 2017 World Championships - W, O, R, L, D, S (for Worlds)
 * Safari Zone event - S, A, F, R, I (for Safari)
 * TwitchCon 2017 - T, W, I, C, H (for Twitch)

Castform
The form that a wild Castform appears as depends on the weather when it spawns. Once caught, Castform will retain its form regardless of any change in weather.

In other languages
Specific forms

Form-like transformations