Poliwrath (M) @ Leftovers

Role: Belly Sweeper
Trait: Water Absorb
EVs: 160 HP / 96 Atk / 252 Spd
Jolly Nature (+Spd, -SAtk)
- Belly Drum
- Hypnosis
- Waterfall
- Wake-up Slap
Okay, most think this is Gimmiky, but I have swept whole teams with it.
If You can plan a switch right, you can Water Absorb an Attack, pissing someone off and most likely getting them to switch Out.
On that turn, you can pull off your Belly Drum.
Now, you can Put something to sleep and use Wake-up Slap, or just use it in General to take down Resisting foes, such as other water types, or Ferrothorn.
Hypnosising those who You doubt you can OHKO.