Gastly evolves into Haunter once it reaches level 25 or higher.
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Gastly evolves at level 22 then Haunter evolves by trading it.
Gastly evolves once it reaches level 18. It evolves into a Haunter. To evolve Haunter into a Gengar, you must trade it to another player.
Gastly evolves to Haunter at lv25. And Haunter evolves to Gengar after trading.
Gastly evolves to Haunter at level 25. Then, Haunter evolves into Gengar by being traded.
You have to trade the Pokemon to evolve it.