yes
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trade them off GBA games if you have it on the GBA game.
In order to evolve Haunter, u have to trade and it will evolve into a Gengar.
Haunter at level 25
you catch them ah der
You can't catch a Haunter in Emerald. You can trade for one, you can find a Duskull/Dusclops at MT Pyre, but you can't straight out find a wild Haunter.
You cant. You have to catch a gastly then envolve it to haunter then trade with someone and trade back haunter will envolve to gengar!
in pokemon tower in lavendar town
To get a Gengar you must first catch a Haunter. To evolve the Haunter you have to trade it to another gaming system.
You can catch Haunter in Almia Castle or Oil Field Hideout.
Gengar can only be obtained by trading a Haunter.
Evolve a gastly that you can catch in the sprout tower
There's a 30% chance you can catch a level 19 Haunter in the grass on Route 8 at night. You can also catch level 16 or 17 Haunter in the forest region of the Johto Safari Zone at night.
There is no place that you can catch a Gengar and he can only be obtained by evolving Haunter via trade.
In Lavender Town there is a tall building known as the Pokemon Tower. Catch either a Gastly or Haunter, I would catch a Gastly (if you don't have one already) and make sure it evolves into Haunter. Once you have a Haunter trade it with someone, and it will evolve. Then just trade back and you got yourself a Gengar! Good Luck!
No it isn't possible through normal gameplay in any game of the series unless you count the Snag Machine in Pokemon XD and Colluseum.