Regirock

{t}: Remove a Slumber counter from target Artifact. Activate this ability only once each turn.
Whenever Regirock attacks, you may pay X. If you do, deal X damage to target creature, where X is the number of mountains you control.
Regirock was sealed away by people long ago. If this Pokemon's body is damaged in battle, it is said to seek out suitable rocks on its own to repair itself.