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Barry easily, he is the most energetic and probably in the best shape. He'd win without breaking a sweat and still be ready to take on more.
Hop would come in second because he's a real go-getter and is determined to not disappoint the people in his life. Hop is probably the guy who'd try the hardest, in the end though he just isn't that strong physically.
Hau just doesn't have it in him to fight, he's physically stronger than Hop, but is too compassionate to actually beat people up outside of Pokemon battles.