Pewter city pokemon center
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There is no NPC who you can trade a Haunter to for a Gengar in Pokemon Crystal. To get Gengar you will need to trade with another player or a copy of Pokemon Gold, Silver or Crystal.
Haunter evolves through a trade.
Trade Haunter and you will get a Gengar.
Trade Haunter with any Pokemon to make it evolve!
you have to get a cable on the game boy and go to the Pokemon centre with haunter and get your friendwhich you connected with and press the trade button and select the Pokemon you want to trade