Competitive

Competitive raises the ability-bearer's Special Attack by two stages when hit by a stat-lowering move. Stats can be raised to a maximum of +6 stages each.

Game descriptions

X, Y, O.Ruby, A.Sapphire:Boosts the Sp. Atk stat when a stat is lowered.
Sun, Moon, Ultra Sun, Ultra Moon:Boosts the Sp. Atk stat sharply when a stat is lowered.
Sword, Shield, B.Diamond, S.Pearl:Boosts the Sp. Atk stat sharply when a stat is lowered.
Scarlet, Violet:Boosts the Pokémon’s Sp. Atk stat sharply when its stats are lowered by an opposing Pokémon.