The method of acquiring the Shadow Pokmon Gengar entails a particular technique tied to buying and selling. Particularly, a Haunter have to be traded to a different participant to set off its evolution into Gengar. This evolution is a direct consequence of the commerce; upon completion, the Haunter will remodel.
This evolution technique has remained constant throughout the core Pokmon sport sequence. Buying and selling has all the time been a core mechanic, selling interplay and collaboration between gamers. Securing Gengar requires reliance on one other particular person, making it a probably rewarding, if typically difficult, purpose.