Poliwrath double fight moves

His best matchup would probably be tyranitar. Poliwrath resists all of tyranitars moves and tyranitar takes SE damage from all of Poliwraths moves. In a couple of weeks tyranitar should start to dominate gyms and a good Poliwrath is gonna come handy.

He will be good attacker. Dynamic Punch is just phenom, flat out awesome.

Rock Smash on the other hand doesn't lend itself to offense so much. It's 1.3s animation time is a bit slow, relatively poor for dodging, and it has a higher DPS than it does EPS which is not as preferable when you have a 2 bar charge move like DP at your disposal.

He will be a beast on defense with that that ms though, if you find a gym with low average CP.