you push the gates around until you have a clear path to the gym leader
In the cinnibar island gym.
in the gym
you need to go inside the lighthouse, go up the elevator, and talk to the special looking man in blue. (gymleader) he will return to his gym afterwards
The Fortree gym.
Fortree City.in fortree city
Once you talk to Flint in front of the gym itself, travel on the panels and go inside the lighthouse. He should be in there. He'll ramble on for about a minute, and then you can go to the gym and you may go inside.
Defeat the gymleader.
At fortree city.
the gym is in fortree city and it is flying type gym
winona is the flying type gym leader
The 6th gym is located in Fortree City.
you goto the fortree gym.