Now you will
probably notice that Team Rocket blocks the entrance too most if not
all of Saffron City, including the Gym. For now head to one of the
bottom houses and get TM 29 from one of the citizens. Next head too the
gym that is not being blocked off. Inside will be a gym full of
fighting Pokemon. Not too difficult and beating the leader gives you a
free Pokemon (much better than a badge if you ask me ^_^). Choose
between either Hitmonlee or Hitmonchan, they're both good choices and
you can't really go wrong with either.
Now head to the center of town into the Silph Co., it's the
biggest building there so you can't miss it. The Silph Co. is
practically a maze so if you want to get this over with (I recommend
beating everyone in the building for money and exp.), just follow these
steps. Take the elevator to the fifth floor. Now head all the way to
the left and then head down. Enter the teleporter tile, and then head
back onto the teleporter tile. Head down, beat the rocket and then head
right and grab the Card Key. Now head back to the elevator and go to
the 3rd floor. Head down and open the locked door and enter the tile
teleporter. You will meet Gary once more and his Pokemon and all
evolved this time, however you should still have little trouble against
him. Defeat him and you will receive a Lapras from one of the
employees, just keep heading forward from there and you will reach
Giovanni in no time. Defeat him to receive the Master Ball. With Team
Rocket gone head to the gym and prepare to fight Sabrina. She is a
monster in this game so be sure that all your Pokemon are strong enough
to take her on

-------Gary----------------

Trainer: Gary
Pokemon: Sandslash Lv.38
Ninetales Lv.35
Cloyster Lv.37
Kadabra Lv.35
Vaporean, Jolteon, or Flareon Lv.40

Now this battle will be a bit tougher than the last one. The same
water Pokemon you used last time and Pikachu can easily take out
Sandslash, Nintales, Cloyster, Vaporean, and Flareon. However Gary's
Kadabra and Jolteon are a different story. For Kadabra just pound on
him with any attack (except Psychic) and hope you take him down
quickly. Jolteon can be pretty tough, but using a Ground type Pokemon
(Diglett, Dugtrio) can easily defeat Jolteon.

---------------------------

-------Sabrina-------------

Trainer: Sabrina
Pokemon: Abra Lv.50
Kadabra Lv.50
Alakazam Lv.50
Prize- Marsh Badge
- $4950
- TM 46

This will probably be your hardest battle yet. All of Sabrina's
Pokemon are at Level 50, one of the strongest type in the game,
Psychic, and overall can be just plain difficult. I highly suggest that
you raise your Pokemon's level to at least 50 or around 50 to have a
good chance. Sabrina's first two Abra and Kadabra are actually not too
difficult I just took my strongest Pokemon and attacked. A few turns
later they were both down. However Alakazam is a different story, if
you can try putting him to sleep, that's what I did and had very little
trouble. Just beware of Alakazam's recover or you may very well lose
this match.

i tryed that in the silph building and it didnt work

I Just battled Them in order