You have to go into Rocket Hideout under Celadon Game Corner. Upon defeating the members of the hideout, and I think (but I'm not certain) Giovanni at the end, you obtain the Silph Scope. Then you can go back to pokemon tower and identify the ghost and move on with your life.
Go to celadon city and find the game corner then go in there and beat the rocket in there then press the switch behind the poster then go downstairs and get the lift key in the rocket game corner then go to basement floor 4 and beat Giovanni then get the silph scope.
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You must have the Silph Scope with you in order to identify them. The Silph Scope can be obtained at the Rocket Hideout (Game Corner in Celadon City) after having defeated Giovanni.
There is no silph scope in Silver, as Lavender Tower doesn't exist anymore.
In Pokemon FireRed you have to get through Silph Co to continue. To get through it, you need to be able to beat 31 trainers.
you have to go to lavender town, with a silph scope. when you get there go into the Pokemon tower and go to second floor. you can only catch gastly and haunter
saffron city