That building is in saffron city.
saffron city
You need to get the Silph Scope.
It is located underneath the game corner in celadon city.
The ghosts can't be fought in their current forms. To beat them you have to see them and you can when you get a Silph Scope. You get the Silph Scope in Celadon City somewhere (No spoilers unless u want them)
You get it from one of professor Oak's aids i believe, other wise, you get it from someone from the Silph Co.
saffron city
You need to get the Silph Scope.
It is located underneath the game corner in celadon city.
The ghosts can't be fought in their current forms. To beat them you have to see them and you can when you get a Silph Scope. You get the Silph Scope in Celadon City somewhere (No spoilers unless u want them)
You get it from one of professor Oak's aids i believe, other wise, you get it from someone from the Silph Co.
You need thesilph scope to see what it is. then, u find out its a marowak and you kill it (because u cant catch it. It was a ghost.) you get the silph scope in silph co.
You will need to use the Silph Scope which is obtained from the rocket boss in the rocket game corner.
You need the Silph Scope to see it, then defeat it.
Use the Silph Scope. You get this by defeating Team Rocket, when they steal it.
You need a silph scope to identify ghosts when you have it you can fight the Pokemon your fighting.
To pass the one ghost blocking your way in Pokemon Tower you need a Silph Scope to identify the ghost. I believe you get the Silph Scope when you defeat Team Rocket nearby at the same point in your game. Good luck! =]
You go to the ghost building in Saffron City and you use it to see the ghosts.