You have to get the Sliph Scope from the Sliph Co. Building after you beat Giovonnie
I Used Drowzee to put it to sleep with the move--Hypnosis and then used my weakest Pokemon to shorten its life bar and then I think I used an Ultra Ball to capture it!!!
Dark type can beat ghost.
tackle
You can beat a ghost type with another ghost type (Like Haunter)
You need the silph scope go to celadon city and go into the rocket game corner find the lift key then use it to go to B4 defeat the boss rocket and grab the silph scope.
You need to beat the ghost by at least seven seconds.
You have to beat 01.03.752 to get a fast staff ghost unlocked on that track. The normal ghost time is 01.06.595 and the expert ghost is 00.59.907.
keep playing poketower 2 and it will apear
Dark-type Pokémon can beat Ghost-type Pokémon and other Ghost-types can also beat Ghost-type Pokémon.
After the shower ghost, you will be given a key to the ballroom. You need to beat several small ghosts by taking off their masks with the vacuum and then vacuum them all. Then a ghost couple will start dancing in the room and then you need to beat them.
beat a normal ghost and expert ghost by 4 seconds
you have to beat your regular ghost by usually 4 - 10 seconds and then a expert ( fast ) ghost will appear and you have to beat it.