Well go to pallet town surf down and you'll reach a town with the next gym (fire type gym). The door will be locked but you get the key from the burnt mansion. Hope this helped.
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Go to Viridian city and beat Giovanni,the gym leader
By defeating team rocket in saffron tower
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.
you go in any order the who have to go across the see vs the fire gym leader them go to oak
After you've beaten all the previous gym leaders(Brock, Misty, Lt. Surge, and Koga), and have obtained the tea from celadon, you can fight Sabrina, whose gym is in Saffron. Your Pokemon should be lv.'s 40+.