Key Stone

A Key Stone (Japanese: キーストーン Key Stone) is a Key Item used to allow a holding a Mega Stone to Mega Evolve. When the Key Stone is activated, the Pokémon's corresponding Mega Stone reacts to it, starting the process.
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Trainers typically embed their Key Stone in a personal accessory, such as a Mega Ring, Mega Bracelet, Z-Ring or Z-Power Ring.

Pokémon X and Y
In, the player characters hold their Key Stones in a Mega Ring (Japanese: メガリング Mega Ring), a large black bracelet that and  wear on their left wrist.

The possession of one Mega Ring is offered to the player and each of his or her friends, who have to pick the most deserving out of their group. The selection is quickly whittled down to two people: the player and or  (depending on the gender of the player). Upon defeating their rival, the player must obtain the at the Shalour Gym and then go to the top of the Tower of Mastery to receive the ring from Korrina.

After the player has beaten their rival in Kiloude City, Professor Sycamore will upgrade their Mega Ring at the Anistar Sundial by having the player touch the sundial. Once upgraded, the player can then find hidden Mega Stones around Kalos from 8:00 PM to 9:00 PM.

Pokémon Omega Ruby and Alpha Sapphire
In, the player characters hold their Key Stones in a Mega Bracelet (Japanese: メガバングル Mega Bangle), a large white bracelet that and  wear on their left wrist. gives the Mega Bracelet to the player on Southern Island after or, holding its respective Mega Stone, joins the player.

The player character also wears a special Mega Bracelet during, Brendan's being a Mega Cuff (Japanese: メガブレス Mega Bracelet), a black band with a circle of large, connected red diamonds affixed to it, with the Key Stone embedded in the band, while May's is a Mega Charm (Japanese: メガチャーム Mega Charm), a chain of cream bows with the Key Stone embedded into a pink heart charm.

avatars of player characters that have a Mega Bracelet will use it in battle if possible.

Pokémon Sun, Moon, Ultra Sun, and Ultra Moon
In Generation VII, after becoming the, the player receives a Key Stone from Sina and Dexio at Ancient Poni Path/Poni Plains after defeating Dexio. They hold their Key Stone in their Z-Ring or Z-Power Ring.

Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!
In Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!, the player receives a Key Stone from at Professor Oak's Laboratory in Pallet Town after earning seven Badges and meeting  in front of the Viridian Gym.

Non-player characters
Many non-player characters use different items to carry their Key Stones than the player characters do.

Pokémon X and Y

 * Lysandre's Mega Ring (Japanese: メガリング Mega Ring) takes the form of a silver ring that he wears on the middle finger of his left hand.
 * Korrina uses a Mega Glove (Japanese: メガグローブ Mega Glove), which is a white glove she wears on her left hand.
 * Diantha uses a Mega Charm (Japanese: メガチャーム Mega Charm), which is a gold pendant she wears on her neck.

Pokémon Omega Ruby and Alpha Sapphire

 * Steven Stone uses a Mega Stickpin (Japanese: メガラペルピン Mega Lapel Pin), which is a pin he wears on the lapel of his jacket.
 * Maxie uses Mega Glasses (Japanese: メガメガネ Mega Glasses), which is a pair of glasses he wears.
 * Archie uses a Mega Anchor (Japanese: メガイカリ Mega Anchor), which is a golden, anchor-shaped necklace he wears.
 * Lisia uses a Mega Tiara (Japanese: メガティアラ Mega Tiara), which is a hair clip she wears.
 * Wally uses a Mega Pendant (Japanese: メガペンダント Mega Pendant), which is a pendant he wears.
 * Zinnia uses a Mega Anklet (Japanese: メガアンクレット Mega Anklet), which wraps around her right ankle.
 * and use Mega Rings during the Delta Episode, which are not seen on their artwork.
 * Sidney, Phoebe, Glacia, and Drake use generic Key Stones after the Delta Episode, which are not seen on their artwork.

Pokémon Sun, Moon, Ultra Sun, and Ultra Moon

 * Sina and Dexio use white Mega Rings (Japanese: メガリング Mega Ring) that they each wear around their left wrist.
 * Some opponents at the Battle Tree and Battle Royal Dome use generic Key Stones, which do not show up on their models.

Price
No Key Stone items can be bought or sold.


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Effect
Allows the player to Mega Evolve their Pokémon if they hold the appropriate Mega Stone. Each Trainer can only Mega Evolve one Pokémon per battle.

Description

 * Mega Ring


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 * Mega Bracelet


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 * Key Stone


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Acquisition

 * Mega Ring: Tower of Mastery (from Korrina after earning the )
 * Mega Bracelet: Southern Island (from after obtaining /)
 * Key Stone: Ancient Poni Path (from Dexio after becoming )
 * Key Stone: Poni Plains (from Dexio after becoming )
 * Key Stone: Professor Oak's Laboratory (from after earning seven Badges)
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 * Key Stone: Ancient Poni Path (from Dexio after becoming )
 * Key Stone: Poni Plains (from Dexio after becoming )
 * Key Stone: Professor Oak's Laboratory (from after earning seven Badges)
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 * Key Stone: Professor Oak's Laboratory (from after earning seven Badges)
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Pokémon Rumble World
The player obtains a Mega Key after completing the Raid of the Mighty General challenge.

In the main series
In Mega Evolution Special I, Alain was seen wearing a Mega Ring similar to that of the protagonists of Pokémon X and Y. He uses it to Mega Evolve his into Mega Charizard X. In Mega Evolution Special II, it was revealed that he received it from Lysandre. After the battle with Lysandre and the Rock Zygarde, Alain gave his Mega Ring to Professor Sycamore to be used for his research.

In the same episode, Astrid was shown wearing her Key Stone as an earring on her right ear, while Remo had his Key Stone embedded into the tip of the umbrella that he carries with him. Siebold, a member of the Kalos Elite Four, was seen wearing his Key Stone in his necktie. Astrid's Key Stone made a brief reappearance during the opening credits of Diancie and the Cocoon of Destruction.

In The Bonds of Evolution!, Diantha tapped into the power of her Mega Charm to Mega Evolve her, giving it the power to break free from 's clutches. The Mega Charm has also been seen during Diantha's subsequent appearances.

In Mega Revelations!, Korrina was shown wearing her Key Stone in her Mega Glove, having received it from her grandfather. However, her lacked the Lucarionite, meaning that she wasn't able to use it yet. After obtaining a Lucarionite in The Cave of Trials!, she was soon able to use her Key Stone in order to Mega Evolve her Lucario.

Another Key Stone appeared in The Aura Storm!, under the ownership of Gurkinn, who uses it to Mega Evolve his own Lucario. Similar to Korrina, he wears it in a glove on his left hand.

A Key Stone possessed by Mabel appeared in The Bonds of Mega Evolution!. Embedded in her walking stick, she uses it to Mega Evolve her into Mega Mawile.

In Diancie and the Cocoon of Destruction, a diamond Diancie had created and given to earlier caused it to Mega Evolve, acting as a Key Stone. At the end of the movie, Bonnie returned the diamond to Diancie.

Mega Evolution Special II featured and his Mega Stickpin. Alain was able to recognize the Key Stone on the 's person, leading him to challenge Steven to a battle.

In the same episode, a giant Key Stone was discovered by Steven and Alain. While Lysandre's scientists were inspecting it, appeared and used the Key Stone's power to Mega Evolve into Mega Rayquaza. Soon after, it disappeared along with the chaos created by Rayquaza's. The stone reappeared in Mega Evolution Special III, along with Mega Rayquaza. It was eventually taken away by Lysandre's submarine to be studied at the Lysandre Labs.

In Garchomp's Mega Bond!, it was revealed that Professor Sycamore had found a Key Stone along with a piece of Garchompite. In the same episode, it was revealed that Blaziken Mask keeps his Key Stone embedded in his belt buckle.

Multiple Key Stones appeared in Mega Evolution Special IV. A Trainer with a has his Key Stone inside of a pocket watch, a  Trainer wears his Key Stone on his turban, Malva carries her Key Stone in a necklace, a  Trainer has his embedded on his Banette puppet, and Lysandre has his Key Stone embedded in a Mega Ring he wears on his left hand.

A Key Stone belonging to Wulfric appeared in A Real Icebreaker!. The Snowbelle City Gym Leader keeps his Key Stone inside of the locket he wears around his neck, and uses it to Mega Evolve his.

In A League of His Own!, was revealed to have a Key Stone embedded on his camera's shutter button. With it, he is able to Mega Evolve his into Mega Charizard Y.

In Valuable Experience for All!, Sawyer was revealed to have a Key Stone attached on the end of his notebook latch. He uses it to Mega Evolve his. In The First Day of the Rest of Your Life!, Sawyer revealed that he received his Key Stone from Steven.

A Key Stone held by Kimia appeared in Volcanion and the Mechanical Marvel, wearing it on a bracelet around her left wrist. She uses it to Mega Evolve her Gardevoir.

A Key Stone belonging to, located on her hair band, and a Key Stone belonging to , located on a necklace under his shirt, appeared in When Regions Collide!.

In The Prism Between Light and Darkness!, Gozu was revealed to own a Key Stone embedded inside a dog-tag necklace that is kept hidden under his Team Rocket uniform. He uses it to Mega Evolve his.

In Pokémon Origins
In File 2: Cubone, after helping drive off driving Team Rocket out of the Pokémon Tower and helping find peace,  received a Key Stone and a Charizardite X from Mr. Fuji. The Key Stone and Mega Stone activated in File 4: Charizard during Red's showdown with, Mega Evolving his trusted starter Pokémon, , into Mega Charizard X and giving them the strength to weaken Mewtwo so that Red could catch it. This Key Stone was not worn in any accessory.

In Pokémon Generations
In The Vision, and Maxie were seen wearing their Mega Bracelet and Mega Glasses, respectively. Furthermore, Archie could be seen wearing his Mega Anchor in The Cavern. None of them was seen using their Key Stones, however.

In the Pokémon Omega Ruby and Alpha Sapphire Animated Trailer
In the Pokémon Omega Ruby and Pokémon Alpha Sapphire Animated Trailer, Brendan and were seen wearing their Mega Bracelets. They used them to Mega Evolve the Hoenn starter Pokémon.

In the Pokémon Adventures manga
In the, was given a Mega Ring with a Key Stone inside from Gurkinn as a child. With it, he can Mega Evolve his Li'l Kanga, Salamè, Élec,, and , into , Mega Charizard X, Mega Manectric, Mega Gengar, and Mega Pinsir, respectively.

Those taught by Gurkinn, the Mega Evolution guru, tend to use Mega Gloves. This includes Korrina, three unnamed students, and Gurkinn himself. Gurkinn stated that he gave Key Stones to 16 people through a Mega Evolution successor ceremony, with X being the sole exception. He later gave his Key Stone to, thus making her a successor as well.

At Lysandre Café in Lumiose City, Diantha shields Y and her friends from Lysandre's Pokémon by using her Mega Charm to Mega Evolve her into Mega Gardevoir.

Lysandre later obtains a Mega Ring from Malva outfitted with a Key Stone stolen from Korrina.

At the Lost Hotel, is made a Mega Evolution successor by Gurkinn. She is given a Mega Ring outfitted with the Key Stone from Gurkinn's Mega Glove. With it, she can Mega Evolve her into Mega Absol.

is later revealed to be a successor as well, keeping his Key Stone on a ring. When not in use, Blue wears the ring around his neck as a pendant. With it, he can Mega Evolve his into Mega Charizard Y.

Blaine later appears at the Pokémon Village, revealed to have reunited with. He had gained a Key Stone sometime prior and placed it in his cane, using it to Mega Evolve Mewtwo into either Mega Mewtwo Y or Mega Mewtwo X.

In the, , , and acquired Mega Bracelets from Ultima and  in preparation for another disaster coming to Hoenn. In Omega Alpha Adventure 2, Ruby successfully used his Mega Bracelet and 's Latiosite to Mega Evolve the Eon Pokémon and soar with it to the Sky Pillar.

Many members of the Draconid people possess Key Stones, such as Zinnia, Renza, Jinga, Tomatoma, and the Meteor Village Elder. While Zinnia keeps her Key Stone in her Mega Anklet, Renza, Jinga, and Tomatoma keep theirs in arm bands, similar to Zinnia's anklet, while the Elder keeps hers in a walking cane. When battling Ruby and Sapphire, Zinnia wears a second Mega Anklet that originally belonged to Aster.

In Omega Alpha Adventure 6, Mega Evolved his  into Mega Metagross with his Mega Stickpin. In PAORAS20, he reveals that he is a Mega Evolution successor, having obtained the Key Stone from Gurkinn. He later gives Zinnia a jar of Key Stones belonging to Aster that were taken from the Embedded Tower.

In Omega Alpha Adventure 11, Maxie and Archie use their Mega Glasses and Mega Anchor to Mega Evolve their and  respectively. After Maxie and Archie disappeared from exhausting the energy keeping their bodies stable, Blaise and took their Key Stones and Mega-Evolving Pokémon.

When battling against Maxie and Archie, and  use rings with patterns similar to the Mega Bracelets to Mega Evolve Saur and Blasty respectively to battle them. Though their rings resemble the one owned by Blue, it is unknown where they received them.

In Omega Alpha Adventure 20, reveals he has a Key Stone placed in the "R" of his chest pocket. With it, he can Mega Evolve his.

Trivia

 * The Key Stone items used by NPCs exist within the data of Pokémon X and Y and Pokémon Omega Ruby and Alpha Sapphire, but they do not have sprites and cannot be obtained in normal gameplay.
 * In Generation VI, before battle with a non-player character that can use Mega Evolution, the Key Stone accessory is often shown off. For Trainers that use VS sprites (such as Korrina and Diantha), often the Key Stone is clearly visible in the zoomed-in VS sprite. For Trainers that use 3D models (such as Lysandre and Zinnia), the camera often starts by focusing on the Key Stone before zooming out to show the full body. Some Trainers, such as / and /, have the Key Stone accessory visible on their 3D model, but it is not focused on. However, other Trainers, such as, and the Hoenn Elite Four, do not have visible Key Stones at all. s have no visible indication of possessing a Key Stone.

In other languages
Key Stone