It's Sabrina. You can see that her Pokemon are much weaker than Koga's and that you reach her city first.
Koga, he is in fuschia city, he uses poison Pokemon
Koga's Pokemon are: Koffing Muk Koffing Weezing
the 5th gym is saffron gym with sabrina!
you can find it in hiddin places that show a pokeball
the fith gym leader in crystal is on an Island in the southwest of Johto. use surf to get to him
The 5th gym is the Fuchia city gym Gym leader Koga
Koga, he is in fuschia city, he uses poison Pokemon
Koga's Pokemon are: Koffing Muk Koffing Weezing
After defeating Koga, who is the fifth gym leader in the Kanto Region, just move on to the next city. You can get the gym badges out of order, so just move on to a city that you haven't defeated yet. Save Cinnabar Island for last, though, because it definitely is the toughest gym.
The fifth Gym can be found in Fuchsia City. The leader is Koga, who specialises with Poison-type Pokémon.
After that, You Will Have to go to the 5th Gym in Fuchsia City - Leader Koga. ^^ Hope That Helps Feel Free To Ask Help ANYTIME! @ LeafGreenFTW@hotmail.com
Assuming you mean after Koga (as Sabrina can be taken on about the same time). Head to Saffron, if you've not given the guards the tea from Celadon (in the mansion) do that first that will open the gates for you to get into Saffron, you will find Saffron overtaken by Team Rocket, head to Silph Co. If you've beaten Sabrina as the 5th. Head South from Celadon via the Cycle Road or alternatively head South from Vermillion via Routes 12-15. (or straight south from Lavender). They will both lead you to Fuchsia and require you to have gotten the Pokeflute from the Lavender Tower as both have Snorlax in the way.
The 5th Gym Badge is in Pastoria. You have to beat Crasher Wake which you met when you were going to the 4th gym. He specialises in water Pokemon. He has Gyrados, Quagsire and Floatzel. They are all in the mid 30's. The best type of Pokemon to use against Gyrados is an electric Pokemon. Against Quagsire you should use a grass Pokemon. On Floatzel you could use either grass or electric Pokemon.
Using Vs.Seeker on people east of cerulean :) (Hope this helps)
The 5th gym in Pokemon Yellow is the Fuchsia City gym. The gym leader is Koga who specializes in Poison/Bug type Pokemon. Once won you will recieve the Soul badge, TM06 - Toxic, & be able to use HM03 Surf out of battle.
It is in Saffron town and the gym leader is sabrina....................................................................i fought her and she is tough but,now I have a level 87 charizard. and I am only 10 years old.
the 5th gym