I actually plan on doing it similar to how it's done in the Manga's. Where as long as the trainers do not directly interfere, pretty much anything goes.

On Round 2, (now that I'm fully caught up story wise), I'm going to have Maple trip the Machop up by yanking a floor mat out from under him, and start smashing on his limbs one by one. Machop anime wise has muscles that don't tire and pretty much a formidable endurance and fighting technique. So... you sweep the leg, keep him from using most of his fighting styles. Mess up another leg and an arm, and suddenly he can't fight back.

It's underhanded... but come on. The treecko was hurt pretty good long before the fight.