Go to vermillion, use digglet cave to get to the next
in the GYM .
The next gym leader is Misty in Cerulean city
at the top of Cerulean Cape with her boyfriend.
First you need to return the machine part to the power plant then find the gym leader on route 25 which is northeast from cerulean city.
by winning a contest and by defeating the pastoria gym leader
Misty, from the Cerulean Gym in Kanto likes Ash.
You defeat the trainers and the gym leader, Misty. Electric attacks are best for this gym.
Misty is the gym leader of Cerulean City.
In Cerulean City
She goes back to the Cerulean gym to be the Gym Leader
You can only get the Sixth Badge from the Sixth gym leader. After defeating the Sixth gym leader, the gym leader will give you the Sixth Badge.
The leader in Cerulean City is Misty, the water-type master. You find her outside Bill's Summer Cottage on the ledge.