Power Trick Claydol
Claydol @ Leftovers/Life Orb
Ability: Levitate
Nature: Impish (+Def, -SpA)
EVs: 252 HP, 252 Def, 4 Atk
-Power Trick
-Earthquake
-Stone Edge
-Stealth Rock/Explosion/Rapid Spin
When people see Claydol, they expect either a Special attacker or a Support Pokemon, and will likely switch in a Special wall. This Claydol takes advantage of that, using Power Trick to give in an impressive base 105 Attack stat. As it's uncommon for Claydols to carry any attack other than Earth Power, Flying-types or Ghosts with Levitate are common switch-ins, as well. This Claydol carries Stone Edge to deal with these threats.
The last slot can be used for whatever support your team needs, be it Stealth Rock or Rapid Spin. If your team has both covered, feel free to bring Explosion to basically guarantee that Claydol takes out at least one Pokemon.
Choose Leftovers for your item if you want Claydol to have increased survivability, or Life Orb if you want more attacking power at the expense of durability.
EDIT: This set is for UU, btw. I wouldn't really recommend it for the OU metagame, because I don't know OU.