gengar can be found on the temple when you figth raiko
that prick that said hypno was it is wrong you need a gengar and in the mystery room there is a probopass
To get a Gengar, you must trade a Haunter and it will then evolve into a Gengar.
you cant find gengar if you not have steal trainers Pokemon cheat
gengar can defeat any Pokemon same with any other Pokemon
Gengar is a Ghost-Poison type.
Probopass is where you find Umbreon. You need a Gengar/Gardevoir/Dusclops/Dusknoir or Mismagius to unseal the door to get Probopass.
gengar cannot evole :P
Psychic Bryce has a gengar in Pokemon platinum.
in blue gengar in red nidorino.
you need to trade it to get it into Gengar
Gengar can only be obtained by trading a Haunter.
There are alot, these are the ones I know of : Gengar, Gardevoir, Dusclops, Dusknoir and Mismagius!