Starmie is a Water/Psychic-type Pokémon introduced in Generation I, and is categorized within the Pokédex at #121 as the "Mysterious Pokémon". It evolves from Staryu by using a Water Stone, and it is Misty's signature Pokémon both in the games and the animated series.
Swift is a special Normal-type move with 60 base power and perfect accuracy. Starmie can learn it naturally only starting with Generation III: in previous games it had to learn it before evolving or using TM39.
As a Poké Ball Pokémon
Starmie can be summoned in Super Smash Bros. via a Poké Ball. Starmie will levitate around the screen to find another character to attack. Once Starmie stops moving and targets a character, it will begin to use Swift. Starmie will not move once it starts using this move. In this attack, Starmie will shoot a flurry of star-shaped projectiles from its core. These stars will inflict small damage to the opponent, but will trap said opponent, allowing for high overall combo damage. A character can also take damage if they touch Starmie itself, where they will then receive vertical knockback. Starmie's attack cannot harm the summoner.