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Toriko by its end was catching up to Dragon Ball Z levels of power, though it's primarily its three strongest characters which have established themselves at Saiyan Saga levels of power.Hand Waved by showing Goku as the most powerful of the three (if only marginally so) and saying that he's already fought some creatures and saved the Earth immediately before these fights. Luffy and Toriko are also able to damage the Akami whereas Goku needs his planet-busting Super Saiyan forms to do so. Luffy, Toriko and their allies able to last against an enemy Goku and the Z-Fighters had difficulty against. Luffy and Toriko are able to fight with Goku on even footing (though Goku, as opposed to his opponents, wasn't fighting seriously 'till the very end, and the fight was most of the time Luffy and Toriko vs Goku, instead of a Mêlée à Trois. And finally presenting both Luffy and Toriko with power-levels comparable to those of Son Goku.Gohan being worfed before he gets to do anything.note Since Piccolo could blow up the moon early in Dragon Ball Z. While Sanji and Sunny are very powerful in their own right, they're still nowhere near Piccolo in terms of raw power. When Piccolo teams up with Sanji and Sunny to fight Akami, the latter two fighters are unable to damage Akami thanks to its Combat Tentacles until Piccolo comes in and catches it off guard.note Zebra's case would make more sense, but even then Vegeta's Galick Gun has enough power to obliterate an entire planet so Zoro at the very least should be a pile of ash. Zoro and Zebra stalemating with Vegeta's Galick Gun.
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Most of these problems are the result of having One Piece and Toriko characters fight along the Post-Buu Saga Dragon Ball cast, when Goku and his allies had already reached insane levels of power in canon. The One Piece x Toriko x Dragon Ball special, being a crossover special, brings out a truckload of these.Very similar to Strong as They Need to Be with the key difference being that this trope gets invoked whenever the characters are brought into a whole new setting/universe/continuity or are handled by a different author whereas Strong As They Need To Be tends to happen within the same setting and is invoked by the main authors. See also, Crossover Power Acquisition, where power from one franchise is transferred to another character during a crossover. Can be justified by Your Magic's No Good Here when the two character's settings are alternate universes, or giving the more powerful character's dimension a stronger Background Magic Field, if such a thing exist in-universe. Contrast Normal Fish in a Tiny Pond, where characters that are weak in their home universe don't suffer from this when brought into a weaker universe and thus appear much stronger there. Compare CCG Importance Dissonance, PVP Balanced and Popularity Power. Another way to get around the same problem is to create a Plot Tailored to the Party.
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