Ability₁₁₉-Keen Eye

💥In Battle💥
🟢Gen³⁺
Keen Eye prevents other Pokémon from lowering the accuracy stat stage of the Pokémon with this Ability.
⚠️It does not prevent Spectral Thief from stealing (i.e., resetting) positive stat changes.
⚠️Effects that decrease accuracy without using stat stages, such as Wonder Skin and Sand Veil, are unaffected by Keen Eye.
⚠️This Ability can be ignored with Mold Breaker, Teravolt, and Turboblaze.
🔴Gen⁶⁺
Keen Eye now also ignores the target's evasion stages.
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🛤️Outside Of Battle🛤️
🟢Gen³⁻⁸
From Pokémon Emerald onward, if a Pokémon with Keen Eye is in the first place in the party (even if fainted), there is a 50% chance it will prevent a random wild encounter that would have occurred if the wild Pokémon would be at least 5 levels lower than the Pokémon with Keen Eye.
🛤️It shares this effect with Intimidate.
🟡Gen⁹
Keen Eye appears to have no effect outside of battle.
~Bulbapedia