Serebii.net has new information about the upcoming new Pokémon GC game. It seems the Shadow Pokémon Project has been revived and the new hero has gotten hold of a Snag Machine and a Scope to seek out dark auras of Shadow Pokémon and a Lv5 Eevee. A Shadow Lugia seems to be a part of the storyline, and should provide GBA players with this legendary previously unavaliable through normal play.

EDIT: pokefor.tk has scans from CoroCoro, which have featured the game.