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.
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AnswerThe sixth gym leader, Sabrina, is in Saffron City, but there will be a guard standing in front to the gym. To remove him, you need to beat Giovanni in the Silph Corp. in Saffron City.
The sixth gym is in Fuschia City, where you fight Koga, Poison type leader.
it is i n fortree city
The fourth gym leader is Erika, the Grass trainer.
The sixth gym badge (the Marsh badge) is located at Saffron City's gym. It is in Gym Leader Sabrina's possession, so you have to defeat her to obtain it.