There is no definite answer, but I think One Punch man is because as we know one punch man has no limit to his power. Sure Goku can transform to Mastered Ultra Instinct which will finally bring some challenge to Saitama, but at the same time Saitama can still do a very serious punch, even though we can't imagine how would it look like, I think even Mastered Ultra Instinct won't be able to stand against someone who has no limit to his power.
Note: This is just my humble opinion.
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You must go to the Frontier Front and talk to a man inside a house. He will offer to teach feraligatr ice punch, but for 64 B.P.
yes i think he exist in every soul but you have to push yourself beyond limit to become like him . I agreed 100% with you man. I, I think that if we try harder and prepare your body physically like goku we just have to push harder and enerve yourself thinking that you can be "a sayan", strongest like goku you will made it. Don't you agree?
Because after he was a grown man, and beaten Majin Buu, an old enemy got dragon balls and turned him into a kid again
it would be a tie because Wario is more stronger and powerful than Mario but Mario has more skills and abilities than Wario also Mario can turn into Super Mario and Wario can turn into Wario Man.
yo cant get it BUT you can go to the man in the way from hearthome to pastoria and he will teach it to a Pokemon for shards.