This is technically the 5th gym, although you can defeat the 6th gym in saffron city before it.
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I think the gym in fuschia city
The sixth gym is in Fuschia City, where you fight Koga, Poison type leader.
the one you get from the gym in fuschia city.
You need to defeat Koga in Fuschia City to use Surf, convienent since its the gym closest to Surf's location.
With a Mew you have to catch him with a Master Ball