Unlocking the full roster in Battle Stadium D.O.N is a grind that involves an "obnoxious" slot machine mechanic after every battle. Many players prefer to bypass this by downloading completed save data. Where to Find Save Files Battle Stadium D.O.N [JP] - GC Saves
In the Japanese menu, look for the options section (usually the bottom-most choice on the main menu). To confirm a save or selection, remember that Japanese games often use the Circle button (PS2) or A button (GameCube) to confirm and the X or B button to cancel. battle stadium don save data
Description: 100% complete! This save file has unlocked: all characters, stages, plus a lot of rewards for multiplayer battles. Unlocking the full roster in Battle Stadium D