Here's something I've messed around with a little recently. Its nothing spectacular, but its functional and a lot of fun to use:
Poliwrath @ Rocky Helmet
Ability: Water Absorb
EVs: 248 HP / 220 Def / 40 SpD
Relaxed Nature
- Rest
- Sleep Talk
- Circle Throw
- Scald
This 'mon is able to do a number of things. First of all, its access to Water Absorb and it taking jack shit from Sludge Bomb allows it to check Volcanion reasonably consistently (note how I'm saying "check" as opposed to "counter" 'cause of the unreliability of RestTalk and how it can't guarantee a win if it comes in on HP Grass like Toxic Jellicent or EBelt Goodra can). Secondly, its typing allows it to hard counter both Bisharp and Weavile as well as SD MegaZor, making it a good way to patch up weaknesses to them on defensive teams. The listed EV spread is tailored to taking on Volcanion; it allows it to take 2 HP Grasses from modest Lefties/Mystic Water variants after Stealth Rock damage, allowing it to use Rest on the second one and to proceed to attempt for a Circle Throw roll with Sleep Talk. Ofc if you switch in on anything other than HP Grass you can proceed to just click Circle Throw with no drawbacks, and if they're locked in with Choice Specs you can mess around with their switching too by giving them no choice with regards to who they go to as well as racking up a solid amount of damage between Circle Throw and potential Spikes/SR damage. The reason I have gone for Helmet as opposed to Lefties is because Poliwrath commonly acts as a KOff switch-in, meaning that the chip damage is more valuable/consistent than the Leftovers recovery. Its nothing spectacular, but its a good (albeit slightly team-specific) choice for defensive teams as it can compress Volc check, dark counter, fat water, Scald absorber and pHazer into one teamslot.