Mew

Mew is a Psychic-type Mythical Pokémon from the Kanto region. It does not evolve into or from any other Pokémon. It is available as the reward for Special Research tasks.

Trivia

 * On August, 2016, Hurricane and Moonblast were replaced with Blizzard.
 * On March, 2018, Niantic announced a new research tasks game mechanic which hints at the possibility of obtaining Mew.
 * Mew always breaks free the first two balls and is caught by the third Poké Ball. Leaving encounter can reset this.