What does starmie's ability " Illuminate " do ?

[Adham.Samir]

What does starmie's ability " Illuminate " do ? , Does it mean that i could find VRs and HRs easier ?, And is " Illuminate " working ? .

 

[The-Predator]

Outside of battle: If a Pokémon with Illuminate is leading the party, the wild Pokémon encounter rate is increased to 200%. It shares this trait with Arena Trap.
Illuminate has no effect during battle.