You have to trade with a friend at a pokemon center. I suggest trading kadabra for hunter. They will both evolve.
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To get a Gengar, you must trade a Haunter and it will then evolve into a Gengar.
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.
you get ur gameboy coulor get a usb cable then strap it to another gba coulor then get say Pokemon red,blue,gold,yellow. then trade a haunter for anyfink then trade back tada!!! instand gengar:)(:):(:):():():():()hohohohohoho9090909
you trade him. and he will evolve into gengar. you trade him. and he will evolve into gengar.
Gengar can only be obtained by trading a Haunter.