Surf south of pallet town to get to cinabar island.
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The sixth gym is in Fuschia City, where you fight Koga, Poison type leader.
I think the gym in fuschia city
With a Mew you have to catch him with a Master Ball
You need the soul badge that is obtained from defeating the Fuschia city gym leader Koga in order to use surf outside of battle.
This is technically the 5th gym, although you can defeat the 6th gym in saffron city before it.