Keen Eye

Keen Eye prevents the Pokémon from losing accuracy, for example from moves like Sand-Attack.

Game descriptions

Ruby, Sapphire, FireRed, LeafGreen, Emerald:Prevents loss of accuracy.
Diamond, Pearl, Platinum, HeartGold, SoulSilver:Prevents the Pokémon from losing accuracy.
Black, White, Black 2, White 2:Prevents other Pokémon from lowering accuracy.
X, Y, O.Ruby, A.Sapphire:Prevents other Pokémon from lowering accuracy.
Sun, Moon, Ultra Sun, Ultra Moon:Keen eyes prevent other Pokémon from lowering this Pokémon’s accuracy.
Sword, Shield, B.Diamond, S.Pearl:Keen eyes prevent other Pokémon from lowering this Pokémon’s accuracy.
Scarlet, Violet:The Pokémon’s keen eyes prevent its accuracy from being lowered.