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"Pokémon Emerald" was developed by Game Freak and published by Nintendo for the Game Boy Advance. It was first announced in "Coro Coro Magazine". It features compatibility with the Nintendo e-Reader and 83 cards launched for "Emerald" on October 7, 2004. This functionality was removed from the English versions. It is the third version of "Ruby" and "Sapphire" and follows a tradition of third releases, e.g. "Pokémon Yellow" for "Pokémon Red" and "Blue". The wireless adapter was bundled with Japanese copies of "Emerald"; this was removed from English versions of the game.