1) Trade a haunter and trade it back
2) Battle a trainer in victory road
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Gengar is a powerful ghost type of Pokemon. In Pokemon Platinum it is possible to capture one by going to the Old Chateau.
Psychic Bryce has a gengar in Pokemon platinum.
If you have Fire Red in your DS, go to the Old Chateu.
trade from other games
A trainer in Victory Road has a Gengar.