After you beat Giovanni in Pokémon Red, Blue and Yellow he goes to the gym in Viridian City. He is the final gym leader.
To the neighbourhood
You will encounter team rocket after you beat giovanni, but you will never encounter giovanni in the game again.
Go to saffron city and go through the silph co building and beat Giovanni again then go to the gym to get your 6th badge.
Beat Giovanni And Go through Victory Road. Hope I help!
You go to Saffron City, go to the Silph Co., take out Giovanni, then beat Sabrina
Go to Viridian city and beat Giovanni,the gym leader
Actually, you get it after saving Fugi. You have to go to Celadon city and beat Giovanni to get the Silph Scope. Then, beat the team rocket grunts and beat Marowak in lavender town and you get it.
The serious last time you beat Giovanni is at the viridian city Pokemon gym.
floor 6 go as south as you can to get card key then floor 3 go on first teleporterto the left
go to the game corner and go to the poster and press a in front of it. go into the team rocket base. beat Giovanni and he will give you the silph scope.
beat Giovanni in saffron, beat the 7th gym finish the quest on the islands and go to viridian city. the gym over there is the 8th gym.
beat the other gyms and it will open. It is giovanni -------------------------------------------------------------------------------------------------------------- DO NOT LISTEN TO THAT ONE You are supposed to get to the underwater cavern and beat team magma then go to sky pillar