The leaf thing @ Liechi Berry
Swarm
252/252 or something that let's you sub 4 times.
Substitute
X-scissor
Agility
Baton Pass
Empoleon and Parasect's love child. Come in, sub, agility, sub down to swarm and liechi and sweep. Then Baton Pass the fuck out of there at the first sign of trouble, preferably to Espeon to bounce back the Skarmory's whirlwind. It's an unconventional member of a BP chain, but it can beat stuff.