In Celadon city.
Celadon City, Leader: Erika. Specialty: Grass. Prize: Rainbow badge.
Her name is Erika
beat erika, fourth (celadon) gym leader, who uses grass Pokemon
The key to the gym
the 5th gym is saffron gym with sabrina!
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.
Yes, if you get the Gym Badges.
Sabrina's gym in saffron city
The fourth gym at Pokemon fire red is grass type gym
the fourth badge is found in celadon city at the bottom in erica's grass type gym
there is a key in the Pokemon mansion... you need it to get into the gym... search the Pokemon mansion thoroughly
The Fourth Gym is in Lavaridge City.
I think the gym in fuschia city