I'm going to have to disagree with Luna
As Weavile is pretty great and all, it's really frail leaving it open to faster priority moves. Or really, anything faster than it.
Good abuser #1 - Azumarill
With its great bulk, it can easily take an unboosted priority and return with a Knock Off. Even access to Belly Drum and Aqua Jet makes this thing a great choice!
Azumarill @ Sitrus Berry
Ability: Huge Power
EVs: 132 HP / 252 Atk / 124 Spe
- Belly Drum
- Aqua Jet
- Play Rough
- Knock Off
This is the standard BD Smogon set. I tweaked the EVs a little bit to make it slightly bulkier.
Good abuser #2 - Scrafty
Pretty good bulk and OK attack allowing it to survive many a hit if you plan on using a bulky variant. Just watch out for birdspam. Dragon Dance + Knock Off makes this thing a beast at +2 or more!
Scrafty @ Leftovers
EVs: 196 Atk/188 Spd/100 Hp/24 Def
-Drain Punch/High Jump Kick
This EV spread gives it average bulk most of the time allowing it to get a DD off. Intimidate provides more bulk while Moxie is for straight up sweepers.
Good abuser #3 - Mew
Ever thought this can ruin your day? No? THINK AGAIN BUD. Will-O-Wisp and Knock Off along with Recover makes for a perfect tank (almost) only struggling against anything with a +1 STAB move if you run no defense investment.
As for a set for this, as far as I'm concerned, way too many to pick out a good one.
Hope this helps!