To play GBA games you should really look at slot-2 cards, or at the DSone. The best setup is an acekard 2 with an ez-flash 3-in-1, imo. For GBC you can use an emulator iirc
Or buy a DStwo?!
Signature
Best DS games: Shin Megami Tensei - Devil Survivor 1/2, KH 358/2 days/Re:Coded, The world ends with you, Pokemon: D/P/PL/SS/W/BW2, Time hollow Waiting for: pokemon x/y ,metroid 3DS (I hope that this will come)