Poké Coupons are a form of currency used in Orre and Pokétopia. In Orre, they are merely supplemental to the normal currency of Pokémon Dollars, however, in Pokétopia, they are the only way to get new clothing and Mystery Gift items.
In Orre, they are used only at Mt. Battle, where several Berries are only available, as well as a number of held items. After defeating an entire area of Mt. Battle, a number of them will be won, with the number increasing as trainers make their way up the mountain.
In Pokétopia, they are won every time a Colosseum is cleared. The number increases with subsequent defeats of the same Colosseum. Most clothing does not require much of them to purchase, however, all of the Mystery Gift items require a large amount of Poké Coupons to be saved up.