Ultra Desert (Japanese: ウルトラデザートUltra Desert) is the home of Pheromosa, accessible through Rarity 1 and some Rarity 2 warp holes in Ultra Warp Ride, located several thousand light-years from Alola. It only appears in Pokémon Ultra Moon.
Ultra Desert is a vast desert landscape filled with turquoise crystals and flowing sand. There are several rocky structures and monoliths scattered around the landscape as well as what appear to be small clusters of shrubs. There are several large boulders that require Machamp Shove to move around, including one giant chunk of a cliff larger than any found in Alola. There is also some rocky terrain that the Mudsdale Gallop is required to pass through
Special encounters
Pokémon Ultra Moon
Pheromosa can be encountered and caught here. One Pheromosa will spawn per visit. Pheromosa will appear as ??? and will not be registered as seen in the Pokédex until caught.