In Lavender Town there is a tall building known as the Pokemon Tower. Catch either a Gastly or Haunter, I would catch a Gastly (if you don't have one already) and make sure it evolves into Haunter. Once you have a Haunter trade it with someone, and it will evolve. Then just trade back and you got yourself a Gengar! Good Luck!
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Gastly > lvl 25 > Haunter > trade evolution > Gengar
Yes. The pokemon is Haunter. In order to evolve Haunter you will have to trade him with a friend and he will evolve. Just trade back to get Gengar.
You mean how you get Gengar then train a gastly to level 25 it will evolve to Haunter then trade to a friend who has firered or leafgreen your haunter and then take it back when you receive it it will be a gengar.
Trade Haunter and you will get a Gengar.
To get a Gengar, you must trade a Haunter and it will then evolve into a Gengar.