Yes, Gengar is a ghost Pokémon. It is also a Poison Pokémon.
Ghost, Poison.
Gengar is the fastest Ghost type pokemon.
Poison is weak to ground and psychic type attacks. Ghost is weak to ghost and dark type attacks. The combination of poison and ghost is only found on the gengar evolution line, which gained an immunity to ground type moves, as of the third generation Pokemon games, due to it's ability: levitate.
The Ghost-type Pokemon in the HGSS Regional Pokedex are: Gastly, Haunter, Gengar, Misdreavus, and Mismagius. The Dark-type Pokemon are: Umbreon, Murkrow, Honchkrow, Sneasel, Weavile, and Tyranitar.
Extrasensory. So far it seems only few legendaries can learn it like Ho-Oh and Suicune. That I know of but yeah.
Gengar is a Ghost-Poison type.
Ghost, Poison.
Gengar is the fastest Ghost type pokemon.
No, it is a Ghost/Poison-type.
Gengar is #94 in the national pokedex, and it is a Ghost-Poison type Pokemon.
Ghost and psychic and bug type attacks
Gengar is a ghost type of Pokemon. You can get it using the duel slot by putting FireRed into the Gameboy slot.
Both ghost-type and dark-type Pokemon are super-effective against any ghost-types.
Best Type is probably Ghost, and best Ghost pokémon in first 256 Pokémon is definitely Gengar.
The three Pokemon that are a Poison/Ghost Type are Gastly, Haunter, and Gengar that are in Pokemon Blue.
If this is the case, the opposing Pokemon used Foresight the turn before, which allows Ghost-type Pokemon to be hit by Normal or Fighting-type moves. Gengar is part-Ghost type, so it would normally be immune to Normal and Fighting-type moves.
Gengar is a powerful ghost type of Pokemon. In Pokemon Platinum it is possible to capture one by going to the Old Chateau.