Remake

A video game remake is a game that is made again, in a new and updated style.

In Pokémon terms, four pairs of are remakes:
 * , remakes of the Generation I games during Generation III;
 * , remakes of the Generation II games during Generation IV;
 * , remakes of the Generation III games during Generation VI; and
 * Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!, remakes of the Generation I game during Generation VII.

The names of the first three remakes are derived from the names of the original source games, with a modifier word attached to the front. Pokémon: Let's Go, Pikachu! and Let's Go, Eevee! are the first remakes of an upper version game, with the game mascots based on the starters of the undefined and rival in Yellow.

Changes
In addition to graphical updates, each pair of remakes also includes all Pokémon in the National Pokédex at the time of release and introduced new features, including new ways to find wild Pokémon. The script is also retranslated for localizations.

FireRed and LeafGreen

 * The Sevii Islands expand the main story and allow the player to obtain Pokémon native to Johto.
 * The new stat system, Abilities, and updated movesets are carried over from Ruby and Sapphire.
 * Genders, friendship and are carried over from Generation II.

HeartGold and SoulSilver

 * The physical/special split, foreign Pokédex entries, Pal Park, and the are carried over from Diamond, Pearl, and Platinum.
 * The Hoenn Sound and Sinnoh Sound can be used to find Pokémon native to those regions.
 * The Pokéwalker replaces the Pokémon Pikachu 2 GS.
 * The Global Terminal is added to Goldenrod City.
 * Walking Pokémon return for the first time outside of Amity Square since, and now all Pokémon can walk with the player rather than just.
 * The Pokéathlon is introduced.
 * and are introduced, which lead to the new Johto Safari Zone. The locations Cliff Edge Gate, Cliff Cave, Embedded Tower, and Safari Zone Gate are also added along this new path.

Omega Ruby and Alpha Sapphire

 * The physical/special split, foreign Pokédex entries, the Fairy type, and Mega Evolutions are carried over from X and Y.
 * The Pokémon Contest has been enhanced and it is now called the Pokémon Contest Spectacular.
 * and can undergo Primal Reversion.
 * Mauville City has changed in appearance from Ruby and Sapphire, being mostly an indoor city.
 * can be encountered by completing the Delta Episode post-game story.
 * Most Legendary Pokémon since Generation II can be encountered.
 * The player can fly around Hoenn with or.

Anime
Due to the release of FireRed and LeafGreen, in the, and  traveled back to Kanto to compete in the  (also a reference to Emerald) and Kanto Pokémon Contests. However, its influence can be seen as early as Grass Hysteria!, where befriended and caught a.

Due to the release of HeartGold and SoulSilver, several references to those games appeared in the, such as the Pokéathlon in A Marathon Rivalry!, the Johto Festival introducing several in-game Key Items, Ash's main rival being Paul who resembles in many ways,  temporarily journeying with the gang and her attempt in participating in the Johto League, about half of the Johto Gym Leaders reappearing with their redesigns, and several main characters obtaining Pokémon in the Johto Pokédex like Dawn's Quilava or with a cross-generational evolution line like Ash's Gliscor he caught as a.

With the debut of Omega Ruby and Alpha Sapphire, several references appeared during the. Sawyer, originally from the Hoenn region, was introduced as Ash's new rival and is first shown to have a and a. A Mega and its respective Mega Stone also made an appearance in A Giga Battle with Mega Results!, under the ownership of Nurse Joy.

Many newly introduced Mega Evolutions were seen in Mega Evolution Special II. Steven Stone, in his new design, and his Mega  also made an appearance along with Mega  in the aforementioned special. Both Pokémon reappeared in Mega Evolution Special III with the inclusion of Primal and Primal. Rustboro City made a reappearance in the aforementioned special but was first mentioned in the former. Ahead of the games' release, Mega debuted in Diancie and the Cocoon of Destruction. Primal Groudon and Primal Kyogre also made an appearance in Hoopa and the Clash of Ages with Mega, Mega and a Shiny Mega Rayquaza. Also, a Mega, Mega , Mega , Mega , Mega , Mega , Mega and Mega  made an appearance in Volcanion and the Mechanical Marvel. Steven reappeared in the main series in a flashback in Coming Apart at the Dreams! and in person in The Right Hero for the Right Job!, Rocking Kalos Defenses! and Forming a More Perfect Union!. Steven helped Ash, Alain, Diantha and the Kalos Gym Leaders defeat Team Flare's Giant Rock, first appeared in Mega Evolution Special II as a huge stone that contains huge amounts of Primal energy. At the end of the XY series, decided to travel to Hoenn and compete in Pokémon Contests to improve her skills.

Manga
Generally, only long-running Pokémon manga series are affected by remakes, considering most series begin and end within the time frame of one generation.

In the Pocket Monsters HeartGold & SoulSilver Go! Go! Pokéathlon manga
A manga titled Pocket Monsters HeartGold & SoulSilver Go! Go! Pokéathlon was created at the time of 's Japanese release. It features the Pokéathlon, a new feature added to the remake games.

In the Pocket Monsters HGSS Jō's Big Adventure manga
A single-volume manga, Pocket Monsters HGSS Jō's Big Adventure, was released concurrently with the games, which it takes its name from. It features the adventures of a Trainer named Jō in his travels through the Johto and Kanto regions, following the storyline of the games.

In the Pokémon Adventures manga
In the Pokémon Adventures manga, the, , and return the focus of the story back toward characters introduced in older chapters (the /, , and /, respectively). However, instead of focusing on the whole region like the originals, the main plot of the remake chapters generally focuses on events and places which were new to the enhanced remakes of their game counterparts. FireRed & LeafGreen focuses on the Sevii Islands, HeartGold & SoulSilver focuses on the Pokéathlon, the new Johto Safari Zone, and the Sinjoh Ruins, and Omega Ruby & Alpha Sapphire focuses on the events of the Delta Episode.

In the Pokémon Chamo-Chamo ☆ Pretty ♪ manga
In the Pokémon Chamo-Chamo ☆ Pretty ♪ manga, there are several bonus chapters focusing on characters from Magical Pokémon Journey. As a Generation III sequel of the Magical Pokémon Journey series, this manga was being speculated by fans as a first hint for the remakes of (later was named as ).

In the Pokémon Ruby-Sapphire manga
In the Pokémon Ruby-Sapphire manga, which is based on the Generation III games of the same name, some of the chapters in revolve around Pokémon FireRed and LeafGreen. This includes a character named, who is designed based on 's appearance in the remakes; and a character named , who is based on 's appearance.

Following the Pokémon Ruby-Sapphire series, the manga began a trend of rebooting its numbering and naming system with the release of each core series game. After the end of Generation III and the Ruby-Sapphire series, the manga's story continued with, which led the main characters to Sinnoh. When the Generation II remakes were released, the series once again rebooted with, which led the main characters back to Johto; which they had previously visited during the original Pokémon Pocket Monsters series.

In the Pokémon 4Koma Encyclopedia manga
The manga was released around the time of. It is five volumes in total and has comics featuring each Pokémon in the National Pokédex up to the end of Generation III. The volumes feature artwork of as he appears in FireRed and LeafGreen.

TCG
In the Pokémon Trading Card Game, the TCG EX FireRed & LeafGreen and TCG EX Team Rocket Returns expansions were inspired by and released concurrently with the video games.

Likewise, the TCG HeartGold & SoulSilver, TCG Unleashed, TCG Undaunted and TCG Triumphant expansions correspond with the video games.

TCG Primal Clash was the primary expansion that corresponds with the video games. TCG Roaring Skies, TCG Ancient Origins, TCG BREAKthrough, and TCG BREAKpoint featured Mega Evolutions introduced in Omega Ruby and Alpha Sapphire and also introduced.

Trivia

 * FireRed and LeafGreen, HeartGold and SoulSilver and Let's Go, Pikachu! and Let's Go, Eevee! were all bundled with an accessory: FireRed and LeafGreen originally had the Game Boy Advance Wireless Adapter bundled with them, HeartGold and SoulSilver were bundled with the Pokéwalker and Let's Go, Pikachu! and Let's Go, Eevee! were bundled with the Poké Ball Plus accessory.
 * The accessories included for FireRed and LeafGreen, and HeartGold and SoulSilver serve as precursors to a feature found in their respective following generations. Generation IV expanded on the Wireless Adapter's features with the Nintendo DS's wireless play, while Generation V's was a more robust version of the Pokéwalker.
 * Each set of remakes also uses unique Pokémon artwork on the boxart. This artwork differs from the official standard Pokémon concept artwork that is usually released with the games.
 * All Generation I games have remakes, with FireRed and LeafGreen being remakes of Red/Green/Blue and Let's Go, Pikachu! and Let's Go, Eevee! being remakes of Yellow. Generation I is the only generation with this distinction.
 * Generation I is also the first generation that has been remade twice.
 * While Pokémon Yellow is the only upper version to get its own remake, many core elements from Pokémon Crystal and Pokémon Emerald (that were not included in the original games) were incorporated into the remakes, HeartGold and SoulSilver, and Omega Ruby and Alpha Sapphire.