Offensive Set:
Illumise @ Expert Belt/Life Orb
Ability: Tinted Lense
Nature: Timid
EV's: 252 SpA, 252 Spe, 4 Def
Fake Tears- Lowers opponents SpD, Illumise's only Special attack increasing damage move.
Bug Buzz- STAB and highest damage bug move by Illumise
Shadow Ball/HP Fighting- Shadow ball takes out Ghost types, where as HP takes out steel, rock, ice etc
Thunderbolt/Giga Drain- Both take out water, T.Bolt takes out flying whereas Giga takes out ground and rock
Defensive Set:
Illumise @ Leftovers
Ability: Tinted Lense/Prankster
Nature: Calm
EV's: 248 HP, 252 SpD, 8 Def
Protect- Stalls Toxic and protects for Wish
Wish- Heals Illumise or teammates if switched out
Bug Buzz- STAB and helped if Tinted Lense is in use, best damaging move
Toxic- Stalling and since Illumise is a bad attacker, this helps greatly