Azelf

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

Trivia

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