The 6th Gym Leader of the Hoenn region (FireRed/LeafGreen) is Winona of Fortree City (or Nagi of Hiwamaki City in the Japanese versions). She is the Flying type trainer and gives out the Feather Badge. The Feather Badge allows the move Fly to be used outside of battle and has pokemon obeying up to level 70.
The 6th Gym Leader is Sabrina. The Psychic type Gym Leader. She is in Saffron City.
In Fuchisa city
The 6th gym is in Saffron City the gym leader is Sabrina she uses Psychic type pokemon.
in fuchsia city
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 sixth gym leader,Sabrina, is in Saffron City.
The 6th gym leader is in Fortree City.
Step on the portals until you get to the gym leader.
Viridian City, Giovanni(Team Rocket Leader) is the Gym leader.
beat the gym leader
Her name is Erika
On cinnibar island.