Even though this game Is pretty old it sure as hell remains my favorite game on the GBA and i mean all of them especially MMZ3

best song of the whole megaman series as a whole? maybe, maybe not.

Battle Demi-Fiend - Shin Megami Tensei V

Persona 4 Arena BGM- Reach Out To The Truth (P4 Arena Ver.)

Game: MegaMan Zero 2
Title: Departure
Platform: Gba
Year: 2003