Foundry (Ability)

Foundry is an ability exclusive to Pokémon Zeta and Omicron and Pokemon Insurgence. It is the signature ability of Mega Steelix.

Description
Rock-type moves, when used, melt and become Fire Type [sic]

Effect
Foundry causes all Rock-type moves used by the Pokémon to become Fire-type and receive a 30% damage boost in addition to all other modifiers.

Furthermore, Foundry also causes Stealth Rock to become a Fire-type entry hazard as well as allowing it to stack with the Rock-type version of itself.