Gengar is a ghost/poison type so... ghost and dark types are super effective against ghost types.
ground and psychic types are super effective against poison types
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Gengar is a Ghost and Poison types so use water and steel. (Ghosts hates water and poison can’t pass steel.)
Darkness Pokemon. A Banette should do the trick.
Deoxys, nah Gengar or Dusclops, i'd say. Gengar the best, but u gotta trade for it, and you cant get it in all games. Dusclocs takes 2 pp instead of 1 for each and every attack made against it, also it can learn various moves.
yes except gengar he can faint if a foe has a empoleon
To get a Gengar, you must trade a Haunter and it will then evolve into a Gengar.
Gengar! I have a lvl 100 Gengar! He's AWESOME!