Uxie

Uxie is a region-exclusive Psychic-type Legendary Pokémon from Sinnoh region. It doesn't evolve into or from any other Pokémon. Along with Mesprit and Azelf, it is a member of Lake Guardians.

Trivia

 * On April, 2019, there were reports of the Uxie and the other Lake Guardians appearing in the wild.