There is no ghost tower but there is a lost tower where you find ghost Pokemon on route 209.
There are two towers in Pokemon Pearl that involve spirits. The tower where you find mostly Ghost-type Pokemon is called Lost Tower and can be found in Route 209, south of Solaceon Town. The other tower that involves spirits is Hallowed Tower, which is found in Route 209 south of the Lost Tower. Hallowed Tower is part of a multiplayer-based side-quest that causes a Spiritomb to spawn.
You can find Ghost-Type pokemons in Pokemon Tower in Lanvender City
Battle Tower.
go to the mansion in eterna forest, there also is a legendary Pokemon in the t.v.
In Pokemon Yellow you have to find the silph scope, and then go the the tower and it is the unidentified ghost!
It is at the Battle Tower for 48 BP.
you find strength at the top of the lost tower. talk to the people there
go to oreburgh city then go underground
you need to find the silph scope this will reveal the ghost to be a marowak you can then defeat it
You find it in Lost Tower (some ghost Pokemon if you catch them hold a cleanse tag as well).
beat Pokemon league go to snowpoint and take the boat. signed arceusrocks.
You can find her in the Battle Tower multi battle room