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Gastly (ゴース, Ghos) is a fictional creature from the Pokémon games.
Gastly is a Ghost/Poison dual-type Pokémon introduced in Pokémon Red and Blue, and is categorized within the Pokédex at #092 as the "Gas Pokémon". It evolves into Haunter at level 25, which can then evolve into Gengar when traded with another player. They were the only Ghost-type Pokémon in the first generation games. Gastly and its evolutionary relatives can be found in various games in the wild in haunted areas, caves, and at night.
Gastly's immunity to direct attacks in Smash is likely a reference to the Ghost type immunity to Normal- and Fighting-type moves in the Pokémon games.
In Smash Run
Gastly appears as a somewhat common enemy. It causes darkness damage on contact, and occasionally charges towards the player after a random period of time. Gastly is immune to all direct attacks, only taking damage from indirect ones, such as projectiles and other launched enemies.