Look on your pokedex it'll show every single kind of Pokemon find gastly click on him scroll down and you see the places where it can be found if its in theres not one place it'll pop up when your exploring and my name on it is RedSuicune comment me and I'll tell you more information on getting legends
Go to lavendar town and then enter Pokemon tower in there you can find a gastly.
Gastly is found in Bellsprout Tower.
you find gastly in the Burned Tower and the Sprout Tower
you can find him there and in bellsprout tower
To get Gastly you have to go to sprout tower at night.
Go to lavendar town and then enter Pokemon tower in there you can find a gastly.
Gastly is found in Bellsprout Tower.
you find gastly in the Burned Tower and the Sprout Tower
evolve gastly.
In the Pokemon tower or sprout tower.
you will get Gastly, hunter and the gost is a Marowak.
you can find him there and in bellsprout tower
The only Pokemon you can find in the old chateau are gastly and Rotom.
Once you have the silph scope you can go inside Pokemon tower and randomly on the floors where its foggy gastly can appear. Also you can find gastly inside lost cave on five island.
go on Pokemon crater
Gastly is unobtainable in Pokemon Ruby. You need to trade one from Pokemon Firered or Leafgreen.
get a gastly get it to level 24 then walla you have a hauter