you must go into the old mansion on the island and search for the key. the mansion is inhabbated by a couple Pokemon such as vulpix to muk it also has many items and trickey door locks
You have to go into the pokemon mansion, find your way through it, and pull a switch and the gym will open.
its in cinnabar island, south of pallet town use surf to get there it is a fire gym
The key to the gym
You would basically need to know about Pokemon to take the quiz then just use mainly water type Pokemon.
The fifth Gym Leader in Pokemon LeafGreen is Koga, the leader of Fuschia City's Gym. He specializes in Poison-type Pokemon and hands out the Soul Badge.
the 5th gym is saffron gym with sabrina!
You get the Volcano Badge from defeating Blaine, the gym leader of Cinnibar Island. He uses Fire-type Pokemon.
Yes, if you get the Gym Badges.
Sabrina's gym in saffron city
there is a key in the Pokemon mansion... you need it to get into the gym... search the Pokemon mansion thoroughly
Giovanni is the leader of team rocket and the 8th gym leader in fire red and leaf green.
You cannot get to Fire Island on Pokemon LeafGreen. Fire Island is a setting exclusive to the second Pokemon movie, Pokemon the Movie 2000.