In which city? In celadon, go to the game corner and press the button behind the rocket poster. Then head through the underground maze...
simple beat all gyme leaders and you will face giovanni at the last gyme
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Defeat Team Rocket's Boss in the game corner he will leave the silph scope behind take it then leave.
Go through the rocket game corner and defeat team rocket's boss Giovanni once he goes away an item will appear take it its the silph scope.
You look for the team rocket boss and before you have face team rocket grunts and also your rival
Viridian City, Giovanni(Team Rocket Leader) is the Gym leader.
dark type Pokemon are said to be created after team rocket. some dark types are umbreon and tyranitar