first of all you go into the gym, the u ride the eleveator and click on a door that's how u get 2 her depending on wat Pokemon u have says how u will beat her, she's not that hard
From Daniel Dorn
level up your Pokemon and get many full heals
You need to get further that the 4th gym leader to do that
you surf to them
go to snowpoint and Canalave Citys
vertanturf and slateport
Blue is in Cinnabar Island. But to be able o fight him, you have to find Blaine, the gym leader. He is in the Seafoam Islands. Beat him and then talk to Blue again. H will then return to his gym.
in cinnabar island after you beat all 15 gym leader
just about everywhere except citys
After you awaken Groudon
tropius.. pastoria citys great marsh =]
The Fighting Dojo isn't a real Gym, but a place where you can rebattle Gym Leaders after receiving their Phone Numbers. The Leader of the Dojo is deep inside of Mt. Mortar, and if you beat him, he gives you the Pokemon Tyrogue, which evolves into either Hitmonlee, Hitmonchan, or Hitmontop.
the gyms are in the citys but some are harder to get into than others