You need to get the Silph Scope from the Team Rocket Hideout in Celadon City.
I don't know what tower you're talking about but I'f it's the ghost one you need the silph scope to see the ghost, It's a marowack but you cant capture it, because it's still a ghost but you can see it with silph scope.
shadow ball is the strongest ghost TM
Get the silph scope.
You cannot catch the ghost in the Pokemon Tower until you reveal what it really is.
yes its really a Pokemon only you need a special item to see them once you have it go back and the ghost is now a Pokemon
There is no time in FireRed.
first you need to go to celadon city game corner, activate the poster on the wall. and defeat the team rocket boss. from this you will gain a silph scope this enables you to see the ghost, and defeat it
HOW AM I SUPOSED TO KNOW ASK SOMEONE ELSE
Technically yes and no a GHOST can't be captured but with the silph scope you can reveal the Pokemon's true identity which is gastly which is a ghost Pokemon so that makes sense.
some people say or prove that they see ghost if it is true people see ghost but i think there are no ghost
Work your way to the top of the Pokemon Ghost Tower and defeat the Rocket Grunts.
You have to defeat Koga or the Ghost tower, I think.