You need to find the card key which is on 5F at the bottom. There will be a teleporting panel and a rocket in your way but don't let that put you off. Go onto the teleporting panel and then back again. Afterwards go down to 3F and use the card key to open the barriers in the middle of the room. One of the teleporting panels there will lead you to a room where you battle Gary (and talk to a silph worker to pick up a Lapras). There will be another teleporting panel. Then Team Rocket will battle you. Defeat them and move on down for the boss.
If you want the silphscope, then you'll have to beat the team rocket boss in Saffron city. If you want silphscpe Pokemon go to the Pokemon graveyard building in lavender town and you will find a silphscope Pokemon guarding the stairs to the last floor on top.(The BALCONY).
The boss of team Rocket.
you get it in silph co which is in saffron city. after the boss fight, the leader of silph co gives you one.
go to celadon city and on the top floor there is a person who sells drinks buy one. go right to a officer who tell you he's thirsty give him the drink and that will take you to saffron city . from then just go across intill you find a big building without a team rocket on the door that's it but i suggest you go to the Pokemon centre first and the gym (only one's open if you defeat all of them you can pick one of 2 Pokemon) good look.
You receive the marsh badge after defeating the gym leader Sabrina. Her Gym is located in Saffron City. Be sure to defeat the Team Rocket boss in the Silph Co. Building first, or the doors will be locked. Good Luck!
You must get the hot tea from an old women in Celadon City. Next, go to the pathway where the men who are thirsty are. Give them the drink, and they will let you through to Saffron City.
you have to beat the team rocket boss giovani. he will be in the biggest building insaffron city. then you will be given a master ball and team rocket will leave the city. then go to the gym and beat sabrina. but be careful, she uses psychic pokemon.
Sabrina's gym is located in Saffron City but the entrance is guarded by a Rocket member. To make him disappear, you must go to the Silph Co. building. This is the biggest building in Saffron City and is roughtly in the middle of the city as well. Ascend you way to the 11th floor and defeat Giovanni. Once you do so, all of the Rockets will go away and the entrance to the gym will be open.
In pikachu's snatch
Well in order to be able to fight the 6th gym leader who is Sabrina in saffron city first you must face team rocket in the sky scraper building in saffron. You will come up against Gary as well as Giovanni, or boss rocket. Beat them and when they disappear you will be able to enter the gym.
You must defeat Giovanni, the boss, on the top floor and any grunts blocking the way to him.
Basically the big corp. in the center of saffron city is where Giovanni is. go through the place which is sort of difficult but not really and he will be at the top. when you beat him the boss of the company will be like yo here is the master ball. after that the guy in front of the gym will be gone