gengar can defeat any Pokemon same with any other Pokemon
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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!
How do you get a gengar in emerald
Gengar does not evolve anymore.
Alakazam is a tough Pokemon ghost Pokemon can easily defeat it or dark Pokemon like Gengar or Umbreon or Murkrow. Bug Pokemon are also effective against it, but the same works in reverse.