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I don't actually own a GBA, but I have roms/emulators
Emulators
Visual Boy Advance
Boycott Advance (haven't used in awhile)
Roms e=Europe, u=US and j=japan
49 Nes Games in 1 (hack) (?)
Chessmaster (e)
Chu Chu Rocket (u)
Cruisin' Advance (u)
Droopy's Tennis Open (e)
Golden Sun (u)
Lilo and Stitch (u)
Medabots AX Metabee Version (u)
Pinball Challenge Deluxe (e)
Pinball of the Dead (u)
Robot Wars Advance (e)
Scrabble (e)
Sponge Bob Square Pants (u)
Spy Hunter (u)
V-Rally 3 (e)
Zoo Cube (u)