Visual Boy Advance GX is a Game Boy Advance / Game Boy emulator for the Wii and GameCube based on VBA-M and Visual Boy Advance v1.7.2.

Plenty of GBA homebrews can be found at http://www.pdroms.de/files/gameboyadvance/ – for GB and GBC homebrews you may visit http://www.pdroms.de/files/gameboy/

http://www.wiibrew.org/wiki/Visual_Boy_Advance_GX