Koga, he is in fuschia city, he uses poison Pokemon
the 5th gym is saffron gym with sabrina!
Veridian city
beat erika, fourth (celadon) gym leader, who uses grass Pokemon
Driftveil City. Gym Leader Clay!
In cerulean cities gym you must beat the leader misty to get the cascade badge.
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 8th gym leader is in Viridian City.
the 5th gym is saffron gym with sabrina!
Viridian City, Giovanni(Team Rocket Leader) is the Gym leader.
Step on the portals until you get to the gym leader.
In Fuchisa city
beat the gym leader
Her name is Erika
Veridian city
On cinnibar island.
you get it at safron city gym leader
in fuchsia city