After you beat Jasmine you go back to the city with gym leader Morty and to right of it which will lead you to Mohagany Town! Where you will face Pyrce (ice types)!!
Hope I helped! :D
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beat volkner then talk to jasmine.
building near Pokemon center on cinnabar island
To the Lake of Rage, which is north of Mahogany town.
use fire types for her magnemites then use a ground type for steelix
you go to cianwood city. but you have to surf there. Edit: Actually, you have to go to Cianwood before you beat Jasmine. After you beat her go east past Mahogany to Blackthorne City and face the 8th Gym.