Help me get gengar?

So i started playing a few days ago, and my haunter is like the weakest of my team, could anyone help me evolve it to gengar by trading?

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The Witch Doctor in the black market under Helios City evolves Pokemon that usually require trading.

Thank you so much for the tip!

ok ill do it

Reviving conversations that are older than a month is really annoying for everyone involved. The issue is probably resolved or irrelevant