Gengar is a powerful ghost type of Pokemon. In Pokemon Platinum it is possible to capture one by going to the Old Chateau.
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Psychic Bryce has a gengar in Pokemon platinum.
If you have Fire Red in your DS, go to the Old Chateu.
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A trainer in Victory Road has a Gengar.
Its not a TM. Your Pokemon has to learn it. like Gastly :) (Gengar in lvl 100 with hypnosis is pwnage :p)