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Pokemon Red and Green remake
A few Japanese gaming sites have spoken about a Japanese (future edition of a) magazine called Shougaku Gonensei (which is for children in “priamary school”) which has a section called “Pokemon Red + Green”. The rumours say this is the game Denegiki claimed could sell millions of copies in short time. They did not mention the Game Boy Advance “directly”, but that it will be a remake of the originals. Though, so far there is no confirmation of this game.
Source: http://www.ningc.com