You can convert GBA Files to NDS Files and then drag-and-drop them onto your R4 card. If you would like the software then please go to this website:
http://gbatemp.net/index.php?download=816
Also, you can just put a GBA game into your DS, press start, and hit the second button. I'm not sure if this works on all R4s, but It works on R4 for NDS lite.
OK! So, the above answer was retarded because whoever wrote that didn't exactly do his homework and so, didn't know what the question actually meant. The guy who asked the question doesn't want to know if the cartridge gba games work on Nintendo ds. He wants to know if gba games that can be downloaded work on the r4 or not. Well, for the original r4, the gba games work but you need to open them with YSmenu. At least, YSmenu is needed for me to start the gba roms. Dunno about r4 clones.
NO! That guy above is out of his mind! YOU CANNOT PLAY GBA GAMES ON THE R4DS, UNLESS you get the e-z flash ordered. The r4 CAN play gbc (GameBoy Color) games by downloading a software called lameboy. wow buncha idiots cant believe it u can play gba games have no frikin clue what ur talkin bout with gbc games and the guy who said press the second button is a nim tard wow. The middle guy is right 2/3 people wrong wow
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R4 is a ds emulator. You can play roms of ds games, and many more like genesis. the best place to get roms is coolrom.com
yeah but i think u have to get a gba r4 too im not sure
An R4 is basically a mod chip for the Nintendo DS console. You can download games from the internet and put them on your R4 card and play the games on your Nintendo DS.
i'm sorry but you can't in japan she hackt the system but you can't anymore bye
Because the coding of a GBA game is so different from a DS game, there is no way to do it without a slot-2 device like EZFlash 3in1 or an expensive Supercard DSTwo that has the extra memory built into emulate GBA.