You can't catch one in Pokemon Emerald.
you find gastly in the Burned Tower and the Sprout Tower
in the bellsprout tower you can catch a gastly
Evolve a gastly that you can catch in the sprout tower
just catch a gastly in the tower before the first gym and level him til he evolves
You can't catch one in Pokemon Emerald.
you find gastly in the Burned Tower and the Sprout Tower
in the bellsprout tower you can catch a gastly
Entei is a powerful Fire-type legendary; however, it mainly flees in Pokemon FireRed, LeafGreen, Silver, Gold, Crystal, Heartgold, and SoulSilver. It wouldn't hit your Gastly, unless Mean Look is used. You can catch Entei with any Pokemon, because it just requires at least a Poke Ball to attempt to catch it. Be careful, though, if Entei doesn't run or get caught, it can easily defeat Gastly.
Gastly can be found in Pokemon Liquid Crystal in the Burned Tower in Ecruteak City at night. It can also be encountered in the Safari Zone south of Cianwood City.
Evolve a gastly that you can catch in the sprout tower
Gastly Is Common In Both Silver, and Gold. The Places There Found On Are: The Tin Tower, and The Sprout. Though They Appear More In Crystal.
You catch a ghost pokemon, preferably Gastly, and train it up until it has learnt it.
pet cemetery tower in lavender town after you get the silph scope
Nope, Ghastly will only appear during the evening/nighttime.
I believe Gastly is pretty much the only Ghost type you have access to. You can find them on Routes 31, 32, 26, Tin Tower, and Sprout Tower (at night).
You cant catch it. You can catch a gastly, raise it into a haunter. to make it a gengar, you have to trade it and trade it back