I number the blocks with top left being 1, top right being 2, bottom left 3, and bottom right 4. When you enter the gym and hit the first block, the shortest route I've found is 1,1,3.
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the video will tell you everything! :] http://hk.youtube.com/watch?v=iaMyOL26f-s&feature=related
I believe it is on Cinnabar Island. To enter the gym, you have to get through the Pokemon Mansion and find the secret key.
The fourth gym at Pokemon fire red is grass type gym
You cannot rebattle Gym Leaders.
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