Nintendo e-Reader
"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.