I need it all I need is to see it
A trainer in Victory Road has a Gengar.
Or you can see gastly/haunter in a tower under solaceon city or in a house in eterna forest! just evolve it...
If you have a certain game(I think leaf green of fire red) in your gamboy slot, and go to the old chateu, in the room with a picture, you can find wild gengar.
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