B4 of the rocket game corner defeat the boss rocket to get it.
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You must get to the top floor in Silph Co. and beat Giovanni. Once the battle is won talk to the President of Silph Co. to receive the Silph Scope.
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
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.
I think it's the Silph Scope that you need for Lavender Town and it's in the hidden Team Rocket base in the Celadon Game corner on the 4th Floor and Giovanni has it.
You need to get the Silph Scope.