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 rocks that require Machamp Shove to move around, including one giant rock larger than any found in Alola. Mudsdale Gallop is also required for passing over some rocky terrain.
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.