I use:
Metagross @ Expert Belt / Life Orb
Naughty 244 Atk 12 Spd 252 SpA
HP Fire
Grass Knot
Meteor Mash
Earthquake
I surprise kill a Forry ~1 every 3 battles with this. It really dents Hippos, Skarms, Donphans, and Swamperts too.
Also Clefable is a great stall-breaker because it's immune to...