Psychic, Ghost and Dark type Pokémon. Gastly is also strong against itself, if you teach it a move like Shadow Ball. Otherwise get Mewtwo or Alakazam to use their powerful Psychic attack.
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Gastly is a ghost/ poison type, so any psychic or ghost type will be super effective against it.
Go to lavendar town and then enter Pokemon tower in there you can find a gastly.
No, Gastly cannot learn to fly.
Gastly is found in Bellsprout Tower.
Gastly evolves at level 25.