Pokémon FireRed (Poketto Monsutā Faiareddo?, Pocket Monsters Firered) and Pokémon LeafGreen (,Poketto Monsutā Rīfugurīn?, Pocket Monsters Leafgreen), are enhanced remakes of the original Pocket Monsters Red and Pocket Monsters Green video games, the latter of which was released exclusively in Japan. They were developed by Game Freak and published by Nintendo for the Game Boy Advance handheld video game console, and were the first titles compatible with the Game Boy Advance Wireless Adapter which was bundled with the games. They were first released in Japan in January 2004 and released to North America and Europe in September and October respectively. Players could obtain the game early at the Pokémon Center New York on August 28, 2004, as part of a special pre-release event for players who pre-ordered the game. These two games, along with Pokémon Ruby, Sapphire, and Emerald form the third generation of the Pokémon video game series, also known as the "advanced generation".
Being an enhanced remake of the first generation of games, FireRed and LeafGreen feature the first 151 Pokémon from the original Game Boy games, along with many others from later games in the series. This feature allows many of these Pokémon to be obtained for the first time in the newer games, as the original Game Boy and Game Boy Color games are incompatible with the Game Boy Advance games. The upgraded games are once again set in the fantasy world of Kanto and follow the progress of the central character, Red or Green in his or her quest to master Pokémon battling. Both games are independent of each other but feature largely the same plot and, while both can be played separately, it is necessary to trade between the games and the other advanced generation titles in order to fully complete the games' Pokédexes. There was a trademark filed for "Pokemon WaterBlue version" suggesting that LeafGreen may have not have been intended to be available worldwide, but for some reason "Pokemon WaterBlue" never came into development.By ; Wikipedia.com