you can't.you must trade
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You cannot get these pokemon without trading. But you can cheat by using gameshark codes.
you must trade a hauntar
Gengar can only be obtained by trading a Haunter.
Gengar is a ghost type of Pokemon. You can get it using the duel slot by putting FireRed into the Gameboy slot.
Trade it from from Firered or Leafgreen. Or get a gameshark and enter the CORRECT code.