oops, i forgot to add, might i also suggest to keep with the theme:
CLAY FACEmuk @ black sludge
sticky hold
brave
EVs: 252 HP/188 spD/68 atk
- fire blast
- payback
- brick break
- explosion
well this is a smogon standard spread like mesprit but i chose payback to deal with the multiple ghosts and psychics running through OU to help deal as this muk usually will survive an uboosted pyschic. fire blast is to deal with skarmory/fortress/scizor, all physically bulky and weak to fire which is great. brick break can help break down screens as there isnt much more for this set. explosion obviously to deal massive damage and can take out alot with muk.
again not sure who muk would replace, thats prolly your call, if i think of somethin il post it. again team overall is good.
EDIT
also maybe changing empoleon into the sub petaya as its makes for a great late gamer.
empoleon @ petaya berry
torrnet
modest
EVs: 252 spA/192 spe/64 HP
-surf
-ice beam
-substitute
- agility
empoleon is great with its 12 out of 17 types resistance. with that you should be able to find a good time to switch in, then on the opponents switch pull off an agility then sub down to your petaya. farely simple and works like a charm as long as you dont get another empoleon switched in on you
. on smogon it even says that with SR and 2 layers of toxic spikes this set is almost unstoppable, which is why i also suggest using mesprit.