Head to the Seafoam Islands once you have won all 16 gym badges. Work your way through the cave using Strength to move boulders out of your path and defeating any trainers along the way. Once you have reached the end of the cave, exit and you will face the first legendary bird, Articuno. Battle Articuno and once you have weakened it, use a Dusk Ball to catch it.
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!
yes
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.
you have to catch a haunter or something else.
you have to trade from another game
In Pokémon Pearl, in order to catch Gengar you can find wild Gastly in Lost Tower and Old Chateau and then after catching one you can raise it until it reaches Level 25 at which point it will evolve into Haunter and then you can trade Haunter to another trainer in order to evolve it into Gengar and then you can catch wild Haunter in Turnback Cave and you can only catch wild Haunter in Old Chateau in the event of Ruby, Sapphire, FireRed, LeafGreen or Emerald inserted into the Gameboy Advanced slot and then you can evolve Haunter into Gengar by trading Haunter to another trainer.
To get a Gengar you must first catch a Haunter. To evolve the Haunter you have to trade it to another gaming system.
In the safari zone dessert area
In Pokémon Platinum, you can catch Haunter by evolving a Gastly or by finding one in the wild. Gastly can be found in the Old Chateau, specifically in the room with the TV on the second floor. After capturing a Gastly, you can evolve it into Haunter at level 25. Alternatively, you can trade for a Haunter from another player, as it evolves from Gastly through leveling up.
You can catch Haunter in Almia Castle or Oil Field Hideout.
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!