After you beat the other 7 gym leaders fly too the city that has the forest and the gym leader is Giovanni (unexpected). Flying Pokemon and psycic Pokemon plus your starter Pokemon (charizard, venasaur, or blastoise) should do the trick. Good luck! ;)
No, there aren't 9 Gyms in "Pokémon LeafGreen." There are actually 8 Gyms in "Pokémon LeafGreen."
I think you get it in either cinnabar island gym or virdiran city gym
Its in Viridian City, the Earth Badge, vs. Giovanni
The key to the gym
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!
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
I think the gym in fuschia city
viridian city
there isn't one