Marowak Gen5

Marowak @ Thick Club
Ability: Rock Head
EVs: 248 HP / 252 Atk / 8 SpD
Adamant Nature
- Substitute / Stealth Rock
- Bonemerang
- Stone Edge
- Double-Edge

You can also feasibly run a SpDef set that checks Volt Switch but isn't bopped by Hidden Power Whatever. Thick Club still gives it almost 400 Attack too. But this set does that too, with more power.