Catch a Gastly (either in Burned Tower in Ecruteak City or in Sprout Tower in Violet City) and evolve it to a Haunter (it evolves at level 25). When you have a Haunter, just trade it and it will evolve into 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 can find one on Route 44.
The only way is to trade it. You'll need to trade for a Haunter or Gengar if you want to own one.
If you can trade Pokemon from crystal version to gold version my guess is yes
A fake version of Pokemon gold
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 can probably find it on Ebay
In Route 44.
You can find one on Route 44.
pokemon heart gold
The tower
on route 44 you will find him
in golden rod city
The only way is to trade it. You'll need to trade for a Haunter or Gengar if you want to own one.
If you can trade Pokemon from crystal version to gold version my guess is yes
Must evolve it or trade it.
no they both have different names and Pokemon gold you can eaisly find a caterpie and you can find one gold caterpie=gold metapod=pink butter free and silver you can find a silver weedle=silver kakuna = some colored beedrill.