I have seen a few times this Clefable set:
Clefable @ Leftovers
Ability: Magic Guard
EVs: 252 HP / 160 Def / 96 SpD
Calm Nature
- Calm Mind / Cosmic Power
- Moonblast
- Soft-Boiled
- Flamethrower
What would you do against it if Clefable is running Cosmic Power instead of CM? Maybe switching...