Mew @ Leftover
252 HP / 4 Atk / 252 Spe
Jolly nature
~ Fake out
~ Taunt
~ Stealth rock
~ U-turn
Fake out to see if the item of the opponent's lead is leftover, as well as breaking focus sash. Mew is such a fast taunter only slower than few leads, it can easily taunt and set up...