The sixth gym is Winona, the Flying type leader in Fortree City.
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The sixth gym in Pokémon Ruby, Sapphire and Emerald is located in Fortree City. The gym leader is Winona, who uses flying types.
skarmory, pelliper, altaria and swellow. I'm not sure about the levels but the altaria knows earthquake!
the sixth gym is in canalave city
The sixth gym is in Fuschia City, where you fight Koga, Poison type leader.
The sixth gym badge (the Marsh badge) is located at Saffron City's gym. It is in Gym Leader Sabrina's possession, so you have to defeat her to obtain it.