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The fifth one in Hearthome City.
You go to the dragon's den (you need surf for this) then you go up the gym and there will be a house up ahead and you have to fight the old guy in the back. After that the gym leader will come in and give you your badge.
* Pewter Gym - Rock Badge * Cerulean Gym - Cascade Badge * Vermillion Gym - Thunder Badge * Celadon Gym - Rainbow Badge * Fuchsia Gym - Soul Badge * Saffron Gym - Marsh Badge * Cinnabar Gym - Volcano Badge * Viridian Gym - Earth Badge
On cinnabar island. You can get to Cinnabar by using surf from Pallet Town. To use surf, you need to get Fuschias gym badge.
First, go in the Gym and beat Claire. She will then refuse to give you the badge until you go to the dragons den. Exit the Gym, and surf behind it. There will be a cave there. Go in, go around, and take the test to be a dragon master. You need Whirlpool to get through. After this, she will give you the badge. Leave the cave and head to the Elite 4. Good luck.
6th gym badge
Hearthome's badge
Soul Badge (Fuchsia Gym)
Hearthome gym
you dont have to surf to a gym
you have to use the HM surf and surf behind the gym and go in the cave. go to the other side of the dragon temple and go in. awnser the old man's questions and the gym leader will come in and give you the badge. This is to get the 8th Johto gym badge. To get the Kanto one search: how do you get to the 8th Kanto gym badge
Wally's dad who lives next to the Petalburg City gym will give you Surf once you get the badge from the gym.
The Canalave City Gym is the 6th gym. To get there, you must Surf west from Jubilife City. Get HM03 Surf in Celestic Town.
You have to go behind her gym and surf to a cave called the dragon den. Inside surf to a house and she is there. you have to answer some questions to get the badge.
After you defeat Clair, you surf behind her gym and get the dragon's fang.
you surf there. you have to have the 5th gym badge and the hm from wallys parents west of the petalburg gym.
Surf north of the gym to the dragon's den and find the dragon master and Clair will show up and give you the badge