Celebi

Celebi is a Psychic, Grass-type Mythical Pokémon from the Johto region. It was initially available to Pokémon GO Fest 2018 attendees only, but released worldwide a month later.

Trivia

 * On July and July  2018, Pokémon GO Fest attendees had the opportunity to catch Celebi as part of a Special Research quest.
 * On August, 2018, Celebi became publicly available with the launch of a new Special Research task - A Ripple in Time.