Broly. He didn't use half his maximum power in the Broly the Ledgendery Super Saiyan movie and it still took Goku with the combined power of himself, Gohan, Vegeta, Trunks, and Piccolo to do the slightest amount of damage to Broly. While Bojack was defeated quite easily by Gohan and Goku alone. Nobody else even got a chance at Bojack.
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