The sixth gym is in Fuschia City, where you fight Koga, Poison type leader.
I think the gym in fuschia city
With a Mew you have to catch him with a Master Ball
You need the soul badge that is obtained from defeating the Fuschia city gym leader Koga in order to use surf outside of battle.
This is technically the 5th gym, although you can defeat the 6th gym in saffron city before it.
You get it from the Fuschia Gym leader
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 sixth gym is in Fuschia City, where you fight Koga, Poison type leader.
Koga, he is in fuschia city, he uses poison Pokemon
Defeat the gym leader koga in fuschia city, then you can teach your Pokemon SURF.
after getting the Pokemon flute go west of celadon city and wake up snorlax and then head south to fuschia city which is where the 5th gym leader is.
The fifth gym leader is Koga. From Celadon City, you can wake up the Snorlax in the west and ride down the bike trail to Fuschia City, or from Lavender Town, you can exit south and wake up the Snorlax there and proceed south and then west to Fuschia City. Inside Fuschia City, in order to get to the gym, you must go down between the path that goes west and that large rock formation. It's a little confusing getting there. If you know Fly, your Pokemon can just automatically bring you to the area. But the gym is in that row of buildings, and Koga and his gym challenge will be waiting inside for you.
I think the gym in fuschia city
Fuschia Gym.
To get to Fuschia City you must travel down the Cycle Route (Route 17/18) via Celadon.
With a Mew you have to catch him with a Master Ball
To teach a Lapras how to swim you first need to find the hm Surf. Surf is located in the Sarafi Zone at the top of Fuschia City. However, you are not able to use the hm until you beat Koga, the Fuschia City gym leader.