Illuminate has no effect in battle.
Outside of battle
If a Pokémon with Illuminate is leading the party Pokémon, wild Pokémon are twice as likely to appear.
|Generation 3||Encounter rate increases.|
|Generation 4||Raises the likelihood of meeting wild Pokémon.|
|Generation 5||Raises the likelihood of meeting wild Pokémon.|
|Generation 6||Raises the likelyhood of meeting wild Pokémon.|
Pokémon with Illuminate
|170||Chinchou||Volt Absorb||Water Absorb|
|171||Lanturn||Volt Absorb||Water Absorb|
Illuminate as a hidden ability
No Pokémon have Illuminate as a hidden ability.