Make sure you have flash taught to a Pokemon. Go from cerulean city to the right and go into the rock cave once you find the second Pokemon center. Go in the cave, and use flash. Find your way out. Go down until you find lavender town. The gym there is Sabrina.
Be aware; She is a formidable foe with (cant remember which) either psychic or ghost Pokemon. It is highly suggested that you save before you go in the rock cave, various points thru the rock cave, and before you face Sabrina.
10/4,
A Helper
from Sabrina in saffron city
You get the Marsh badge from defeating Sabrina, who is the gym leader in Saffron City. Sabrina uses psychic Pokemon.
Go to Saffron City and enter the gym and find a way to get to Sabrina
Go yo your map and find were u are and searchyour going to need strong pokemon
You release all your pokemons because they hate u
Sabrina is the toughest gym leader. The best way to fight her strong psychic pokemon is to use a pokemon than can take special hits and attack back with powerful physical attacks. Snorlax, Slobro, Hypno, Gyarados, and Lapras are all good options. Sabrina's pokemon are very fast, so it is crucial that you paralyze them. You should always have sleep powder or thunder wave on your team. If you can put her pokemon to sleep, or freeze them, you will win.
Sabrina is not in silph co she's in the gym.
Same as regular red/blue: I believe it is listed as sabrina, but you can skip ahead and beat koga first
The Fifth Gym Leader is Sabrina. She uses Psychic type Pokemon which are: Alakazam Kadabra Mr. Mime and Venomoth. Be careful venomoth is a bug-poison type Pokemon. Good Luck :)
SABRINA
Blue
not really, unless you trade a Pokemon from Pokemon heart gold holding the blue orb