He's in Selaro Town, just south of Polaris Town and of the Thin Forest.
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you can find the move tutor on route 221
Actually to teach this move to Gengar you need to find the move tutor that will teach the move to any of your Pokemon this move tutor is in Viridian city you need the HM Cut to get to him though. Also a move tutor in Pokemon xd gale of darkness will teach Dream Eater to your Pokemon.
You trade them with the move tutor for a move for any Pokemon that you replaced by mistakely. You find the move tutor in Fallarbour town. His house is next to the Pokemon Contest Centre! By RL9
In the house to the immediate west of the Pokemart in Blackthorne City. There you will find the move deleter, the move tutor, the "ultimate move" tutor(who teaches any starter Pokemon with full friendship their ultimate move) and an old lady that will teach your Pokemon Draco Meteor, if they can learn it.
There is no tutor in d/p you must trade the Pokemon to platinum teach it from the shard move tutor in the survival area and then trade it back