You must defeat them.
There is no ghost tower but there is a lost tower where you find ghost Pokemon on route 209.
you need to find the silph scope this will reveal the ghost to be a marowak you can then defeat it
Get a Slith Scope and climb the towe. Beware: the ghost Pokemon that you visually see transform cannot be caught with a Pokeball
You need the Silph Scope to see it, then defeat it.
You will need to have the item called the silph scope which reveals the identity of the ghosts that ghost happens to be the deceased mother of a cubone aka Marowak you will have to defeat her in order to reach the top of Pokemon tower.
You have to attain the Silph Scope to reveal the ghost. Kill it (LVL 30 Marowak) and then fight a series of Rocket grunts to get to Fuji, who gives you a pokeflute.
To get past the ghost, you need to get the silph scope. Or you could do it the easy way by getting a poke doll to make the ghost flee.
You go to the ghost tower
in tower defence ghost pokemon come and its takes a while thouh i hpe it helps
you cant
Sprout Tower.
You cannot catch the ghost in the Pokemon Tower until you reveal what it really is.