[wesreyEXE]

Getting a GBA flash cart, what roms should I legitimately procure for it?

Already getting the Metroid, Fire Emblem and Castlevania games definitely as well as maybe the Final Fantasy ones and the usual Mario Kart and Zelda stuff

[goetia]

advance wars, wario land 4, metal slug, mother 3, megaman battle network(s) 2 & mm zero(s) 2, and ninja five-o. demikids and scurge: hive are apparently good too, but ive never played them.

[Pheen01]

Golden Sun is a pretty decent JRPG for the GBA

[keifer]

Fire Emblem: The Sacred Stones was my favorite. 
Pokemon Emerald if you're into it. 
Kirby: Nightmare in Dreamland was iconic too.

oh, and don't forget about

*Krazy Racers*
me: mom, can we get mario kart?
mom: we already have mario kart at home.
*mario kart at home*