Dragon Ball Advanced Adventure and Kirby are good though. nice graphics and addicting games. also i recommend Sonic Advance 2 and/or 3 and MegaMan Zero 3, i really love them. maybe you could try Yu-gi-oh WW Edition and Duel Masters Kaijudo Showdown, if you like card games, and Megaman Battle Network for some action RPG.
GBA has a great fighting game, Guilt Gear X. the only thing I don't like is the sound (like NES, with no offence) and the diffficulty. I, even being a dumb in fight games, can rock easily my opponents.
But nothing can break Golden Sun hehe

edit: and if you like pokemon, do not forget firered or emerald
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