From Bulbapedia, the community-driven Pokémon encyclopedia.
The Pokéthlon Dome (Japanese: ポケスロンドーム Pokéthlon Dome) is a location in Johto, west of the National Park. It is the place where Pokéthlon competitions are held.
Several things related to the Pokéthlon are available here, both inside and outside of the building.
Salon Shop
The Salon Shop, located at the far right counter, allows for the points earned from competing in Pokéthlons to be traded in for various items, with each item only available to be bought once per day. The item listing changes on a day-to-day basis.
Monday