If you mean that the ghost is in your way you need to find the Silph Scope and if you need help with that you must battle Team Rocket at the Silph Co. When you reach the top floor after a few mind-racking situations you must battle the Team Rock Leader. Once you win you will get the Silph Scope and a Master Ball. Good luck!
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You need to get the Silph Scope.
Get the Silph Scope from the Celadon Rocket Hideout, then ascend to the top of the Pokemon Tower. Then, you'll be able to identify Marowak and defeat it to lay it to rest.
Go up the elevator.
you go to the top floor in the Pokemon tower and then you save mr.fuji and then he give s u the pokeflute
you go to the top because you get ho oh