There are few people in the Dragon Ball universe Goku has lost a fight to, and given enough time and training he will likely be able to beat them in the future – though Dragon Ball Super confirms that there is one person Goku could never hope to beat, no matter how much training he endures.
Goku is one of the strongest fighters in the universe, and in Dragon Ball’s more recent history, his power level has grown exponentially from previously established Saiyan warrior to that of a literal god. In Dragon Ball Super during the Tournament of Power, Goku fights a warrior named Jiren whose power exceeds that of his God of Destruction. While fighting Jiren, Goku was able to unlock the angelic power of Ultra Instinct which marked a new level of power he had never even come close to reaching in the past. Ultra Instinct is Goku’s strongest form yet, beating any Super Saiyan form, and it was enough to bring Jiren to the road of defeat, though it wouldn’t make a bit of difference against the one person Goku will always lose to.
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In Dragon Ball Super Chapter 1 by Akira Toriyama and Toyotarou, Goku and the rest of the Z Fighters are taking a much-needed rest after the events of Dragon Ball Z, which ended with Goku and the others finally defeating the villainous Buu. Even though all of the threats to Earth have been eliminated (for the time being), Goku is stuck in an arguably worse predicament: getting a job. In this issue, it seems as though Goku has found himself a solid gig that pays the bills, but is a job that is draining Goku’s soul and forces him to waste his days on mindless work for money rather than training. Chi-Chi meanwhile, is more adept at work
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