Question

How much does compound eyes increase the chance of a Pokemon holding an item?

Answer 1

If a Pokemon with the ability compound eyes is at the front of the party it increases the chance of encountering a wild Pokemon holding an item by 50%.

Source

Comments

I didn't know that! Now getting a light ball will be much easier!

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Good for farming heart scales too : )

Answer 2

By 50%.

If a Pokémon with Compound Eyes is leading the party Pokémon, the chance that a wild Pokémon is holding an item increases by 50%.

Source