With a Mew you have to catch him with a Master Ball
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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.
This is technically the 5th gym, although you can defeat the 6th gym in saffron city before it.
If you mean the ones below Fuschia City, then I just flew to Pallet Town and surfed to Cinnabar Island then to Seafoam Islands, completed the gym and surfed back up to Fuschia. By then they let me pass. But im sure there must be a shorter way
Surf south of pallet town to get to cinabar island.