The item should be for this moveset:
EVs: 252 Sp. A, 252 Sp. D, 4 HP
Ability: Serene Grace
-Air Slash (for the flinch)
-Thunder Wave (for the Para)
-Dazzling Gleam (for STAB)
-Aura Sphere (for coverage)
Note: This is not a moveset question, I want to know what item I should use for this.