This one works real well to cripple entire teams. Involves Stealth Rock, Aggron / Tyranitar, Roar, and Toxic / Thunder Wave.
Turn 1: Lead with Tyranitar / Aggron, and use Stealth Rock. Make sure he has BULK.
Turn 2: Use Status inflicter.
Turn 3: Use Roar.
Turn 4: Return to step 2.
Note: Skarmory can also do this with Whirlwind.
Note: Use Aggron for the low tier, and Tyranitar is OU, unfortunately.