gastly evolves at level 26
Gastly evolves at level 25.
Gastly evolves into Haunter at level 25, then trade it and it will evolve again into Gengar.
Gastly evolves at level 22 then Haunter evolves by trading it.
Deerling evolves into Sawsbuck at level 34
Gastly evolves at level 20 into Haunter
Gastly evolves to Haunter at level 25. Then, Haunter evolves into Gengar by being traded.
Gastly evolves at LV. 25
Gastly evolves to Haunter at level 25.
Gastly evolves at Level 25.
Gastly evolves at level 25.
Gastly evolves to Haunter at lv25. And Haunter evolves to Gengar after trading.
He evolves at level 25.