Compound Eyes raises the ability-bearer's accuracy by 30%.
In Generations 3-5, this ability's name was formatted as Compoundeyes.
If a Pokémon with Compound Eyes is first in the party, the chance of wild Pokémon holding items increases from 50% to 60% (for common items), 5% to 20% (for uncommon items), or 1% to 5% (for rare items).