Note: Attempt this at your own risk, as this may damage your game cartridge.First, go to the game’s options menu and change anything (so, for instance, change damage from 1 to 3), then exit twice to get out of the menu. Turn the power off immediately following the second exit. This will interrupt your saved data. When you turn the game back on, it will tell you your save file is corrupted. This will effectively erase your old save, allowing you to begin from the start.