Get the Silph Scope and go back to Lavender Tower. You'll be able to see the ghosts.
i want a vulpix in fire red but from things i've looked at there is no vulpix in fire red just leaf green : ( sorry
You need to get the Silph Scope.
Northern part of Seven Island
some ether, awakening, maybe a super potion
Simple. There is no Lost Tower in Fire Red. However, it does exist in Diamond, Pearl, and Platinum. If you're reffering to the tower with ghost pokemon in Fire Red and Leaf Green, then it is in Lavender Town.
By defeating team rocket in saffron tower
You can get Gastly only by trading from Fire Red/Leaf Green it's in Lavender tower.
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Use the Silph Scope. You get this by defeating Team Rocket, when they steal it.
You need the Silph Scope to see it, then defeat it.
As far as I recall the only place it can be used is in the Lavender, Pokemon Tower.
you need to find the silph scope this will reveal the ghost to be a marowak you can then defeat it