The 5th Gym is in Cianwood City in Pokemon Silver, Gold, and Crystal.
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near 5th gym
yes it is in Azalea, but you have to save the slowpokewell before battle the gym leader
You go to Ecruteak City, then head over to Mahogany Town which south of the Lake of Rage. The gym is on the south side there.
press the red buton to raise the waterfall
The 5th Gym is in Cianwood City.