Who would win?
I'm putting all my money on Goku.
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There at least a 900,000 guardians(100,000 for each class) now that many alone would defeat Goku, especially Nightstalker and Sunsinger. Now there are probably more than a billion enemies for us to fight, so he's still screwd. Now he would never make it through the Vault of Glass, let alone defeat Atheon.