You'll have to trade it from Fire red or Leaf green version
Although 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.
Chat with our AI personalities
dark
Wild Gengar can appear in the Old Chateau if you have Ruby, Sapphire, Emerald, FireRed, or LeafGreen in the GBA slot. In this case, it has a 4% chance of appearing.
How do you get a gengar in emerald
You can't find gengar in the wild, you have to get a haunter and trade it.
Trade it from from Firered or Leafgreen. Or get a gameshark and enter the CORRECT code.