You can't find gengar in the wild, you have to get a haunter and trade it.
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You can get it from evolving it atrually or with a very hard to find moonstone I think, or you can also find them in Mt coronet hope this helps a lot! Pokemon diamond version for sure!
Gengar is a powerful ghost type of Pokemon. In Pokemon Platinum it is possible to capture one by going to the Old Chateau.
you cant!!!
Catch a Gastly (either in Burned Tower in Ecruteak City or in Sprout Tower in Violet City) and evolve it to a Haunter (it evolves at level 25). When you have a Haunter, just trade it and it will evolve into Gengar.
You find ghost Pokemon and rotom. And if you have any Pokemon game in your gameboy slot you can also find gengar.