I use this guy a lot, and the best set I've used is:
Avalugg w/Leftovers (Sturdy)
-Recover
-Rapid Spin
-Avalanche
-Curse
252 Def, 252 HP
Curse is the pivotal move of this set. I love to switch this thing in on Mega Ttar, Dragonite, Mega Charizard X etc. They see easy setup bait, Ddance up...