Pikachu's Ghost Festival! Pikachu's Island Adventure! Pokemon x and y special coupon you got it until then, it will remain on your game until you use it or delete the save file. Additionally, the bargain O-power doesn't work for clothing boutiques.
Lucario and the Mystery of Mew! The Rise of Darkrai! The item disappears after use. The coupon is a lie! Pikachu's Island Adventure! For reference, here is a description of how it was done, which might apply to similar future events: