Claydol @ (Light Clay)
Nature: Careful
EVs: 252/Hp, 80/Def, 176/Sp.Def
Ability: Levitate
~Explosion
~Reflect
~Light Screen
~Stealth Rock
This set not only brings out Claydol's immorality, but also shows how great Claydol is as a support to your sweepers. The only thing this set lacks is a reliable recovery move. Stealth Rock should be used first to insure that you get some entry hazard support, and to have the maximum amount of time with Light Screen and Reflect. Reflect is to insure that you don't get OHKOed by those pesky physical sweepers when you're trying to set up. Light Screen is to insure that you don't get OHKOed by those annoying special sweepers like Alakazam, and Gengar. Explosion is so you can do the maximum amount of damage to any of the common leads.
Explosion against a 252/Hp, 0/Def Calm Blissey does from 182%-214% damage. It'll OHKO 100% of the time.
Explosion against a 252/Hp, 252/Def Bold Blissey does from 62%-73% damage.
