buying a hacked gba rom is really a bad idea in many ways.. pretty much all of the "bought" hacked roms i borrow from my friends, the saves dont work. secondly you can just download them and run them on an emulator on ur computer. and if you do buy or download them, getting caught should be the last thing on youre mind, you should be worrying about viruses. only go on safe looking sites. also you CANNOT run gba games on a ds flashcard, however ive heard theyre working on a card with such capabilities, even though months before they said it wasnt possible.. oh, and from personal experience "dont trust torrents", well thats just my oppinion.. hope i helped?