in pokemon tower in lavendar town
You have to trade haunter to a friend to evolve it.
The highest level Pokemon you can catch is a level 70 Mewtwo.
Haunter can level up and evolve. It evolves by trading with another player.
I'm not sure. But if you catch a Gastly in either Burned Tower (Ecruteak City) or in Sprout Tower (Violet City) and train it, you Gastly will evolve into Haunter at level 25. To get Gengar, trade your Haunter and it becomes Gengar.
Gastly evolves into Haunter at level 25, then trade it and it will evolve again into Gengar.
In Pokémon FireRed, Gastly evolves into Haunter at Level 25.
Gastly > lvl 25 > Haunter > trade evolution > Gengar
Gastly evolves to Haunter at level 25.
You have to trade haunter to a friend to evolve it.
level 45 in fire red leaf green
The highest level Pokemon you can catch is a level 70 Mewtwo.
Gastly > lvl 25 > Haunter > trade evolution > Gengar
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.
At level 200
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.
You mean how you get Gengar then train a gastly to level 25 it will evolve to Haunter then trade to a friend who has firered or leafgreen your haunter and then take it back when you receive it it will be a gengar.
You can catch it in Viradian Forest at about level 4 or lower.