Refrigerate

Refrigerate causes all Normal-type attacking moves used by the Pokémon to become Ice-type, and increase in power by 20%. Ice-type Pokémon also gain STAB from those moves (which means an effective increase of 80%).

Game descriptions

X, Y, O.Ruby, A.Sapphire:Normal-type moves become Ice-type moves.
Sun, Moon, Ultra Sun, Ultra Moon:Normal-type moves become Ice-type moves. The power of those moves is boosted a little.
Sword, Shield, B.Diamond, S.Pearl:Normal-type moves become Ice-type moves. The power of those moves is boosted a little.
Scarlet, Violet:Normal-type moves become Ice-type moves. The power of those moves is boosted a little.

Pokémon with this ability (3)