Ultra Desert is a giant desert with white sand and aqua blue rocks covered with aqua blue giant diamonds. Some rocks form a kind of sand waterfall.
To reach Pheromosa, the player character needs to cross a rocky path with Mudsdale and push two giant stones. The player character can then see behind Pheromosa a valley of rocks that resemble burrows.
A Pheromosa is found at each visit in Ultra Desert. It has an aura that boosts its Speed by two stages.