Quoted By:
For Hippo, give it Earthquake, sneaky pebbles, and whatever. Throw leftovers on it too. Pretty decent.
For PWT I saw a ton of success with Serperior. Leftovers + Seed + Toxic + Drain proved to be a pretty good strategy. Even if the seeds and drain did little damage, those plus the leftovers usually kept the HP pretty close to full or full.
Also had a pretty good run by setting up an entry hazard, passing out to eelektross, and having it use toxic, or just spam dragon tail.