The Silph Co. building is located in Saffron City. Walk into the entrance to get in.
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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 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.
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
In Silph Tower
You can find it in Silph Co. on 5F.