I think that Scald should be used instead of Waterfall in Poliwrath's RestTalk set. Scald lets Poliwrath get past things that it should be able to wall, such as Klinklang. The burn chance is also very helpful for facing Pokemon such as Qwilfish, Dusknoir, and Spiritomb or just getting residual damage on common switch-ins like Tangrowth and Mandibuzz. The burn rate really helps this set succeed. Note: Poliwrath's nature should be Relaxed when using Scald.