Fly to pokemon league, go to victory cave, he's at the very bottom left corner :)
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Psychic Bryce has a gengar in Pokemon platinum.
A Gengar can be seen in a battle with Psychic Bryce in Victory Road.
Gallade, but he is psychic fighting type.
Go to Victory Road, make sure you have someone with Rock Climb, and go to the first trainer on the bottom left (You'll see it) and he's a Psychic named Bryce. He'll battle you with a Gengar.
psycho cut, psychic , trick room and teleport.