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Gastly evolves to Haunter at lv25. And Haunter evolves to Gengar after trading.
You'll have to trade it from Fire red or Leaf green versionAlthough its 1st and 2nd evolutionary forms arecatchable; Gengar, unfortunately, are not found in the wild. You can only get them by trading a Haunter from Fire Red or Leaf Green, or through a GameShark/Action Replay code.
You can't you have to trade.
Nope! Not at all sorry. Out the first 151 kanto pokemon, there are four that need to be traded in order to evolve. They are: Graveler -> Golem Machoke -> Machamp Kadabra -> Alakazam Haunter -> Gengar
Gengar learns shadowball at level 45 in fire red, in diamond at level 33