u can not see him u have to trade a haunter to get a Gengar or a trainer will have one
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A Gengar can be seen in a battle with Psychic Bryce in Victory Road.
To get a Gengar, you must trade a Haunter and it will then evolve into a Gengar.
Gengar! I have a lvl 100 Gengar! He's AWESOME!
How do you get a gengar in emerald
Gengar does not evolve anymore.