Originally Posted by kurosaki
how do u get gengar...?
You need to evolve Haunter by trading, who can be obtained in Turnback Cave in Diamond, Pearl or Platinum, or Route 8 or the Safari Zone in Heart Gold or Soul Silver. Alternatively wild Gengar can be found in the Old Chateau in DPPt, provided you have a GBA pokemon game in your DS. They're very rare though.