Use a save game
You can still complete the game and have all the characters because you can do story mode again and change the nickname so your m8ts will never no y you got ss4 goku easily give it a go but make sure you have the corret save file for you game i.e a eur save file for the european game or usa for the other
We have more cheats and tips for this game here, Dragon Ball Z: Shin Budokai Another Road cheats
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