You need the silph scope to do that because one ghost one let you go past it unless you actually defeat it normally you can't because your Pokemon will be scared but with the silph scope you can identify the Pokemon which will be a marowak at level 30.
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You need to get the Silph Scope.
At the top floor of the Pokemon Tower
you go to the top floor in the Pokemon tower and then you save mr.fuji and then he give s u the pokeflute
The top floor contains two fossils. To get to the top, a Mach Bike and Rock Smash are required. Wild Sand shrew and Trapinch can be found in the tower.
go to the top floor and and you also fly off to sootopolis