Mew

Mew is the protagonist of Pokemon: the First Movie, and Lucario and the Mystery of Mew. It is a psychic type. It is able to learn every kind of move.

Pokemon: The 1st Movie
Mew made a cameo appearance at the start of the movie, and did not take a major role until later. A Mewtwo was cloned from Mew's DNA, extracted from Mew's eyelash. Later, Mew started appearing around New Island while Mewtwo was testing his starter Pokémonclones. Mew followed Team Rocket into the main part of the island.

When Mewtwo's other new clones were born, Mew came with them, but disappeared momentarily. When Mew reappeared shortly later, it tried to reason with Mewtwo, which led to a battlebetween the two. Ash stopped their battle by throwing himself in the middle of their attacks, which turned him to stone. After Ash was revived by Pokémon tears, Mewtwo flew away with its clones and Mew went with them. At the end of the movie, Ash briefly saw Mew in the sky, though Brock and Misty didn't see anything. After the CREDITS are over, a brief scene plays showing Mew flying towards the mountains.

Mew makes a brief appearance in the hour-length special Mewtwo Returns. Mewtwo sees it after being thrown into the Purity Spring, although, like in the first movie, it may have just been his flashback.