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Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
Chaos Emerald Saga
When learning of his acquiring of a Chaos Emerald, the Bruiser Boys kidnapped and detained Hawk so they could learn where he had hid the Emerald. Later on, when Knuckles the Echidna showed up to meet Hawk, Li Yan tricked Knuckles into falling into a trap, detaining him alongside Hawk, though with Knuckles skills, the two were able to escape the Bruiser Boys.
After their encounter with Knuckles, the Bruiser Boys would ally themselves with the Society for Observing and Neutralizing Inter-dimensional Creatures and Xenomorphs, with their leader becoming an official member of said group.