You have to have a badge. Then go to Jubilife City.
The sixth gym is in Canalave City of Pokemon Pearl, west of Jubilife City.
In Pokémon Sapphire, the Gym Badges in order would be Stone Badge being the first one that you get after beating Roxanne, the leader of the Rustboro City Gym. The 2nd Gym Badge will be the Knuckle Badge which you will get after beating Brawly, the Gym Leader of Dewford Town. The third Badge will be the Dynamo Badge which will be given to you if you beat Wattson, the Mauville City Gym Leader. The 4th Badge is the Heat Badge and you will get that once you beat Flannery, the Gym Leader of Lavaridge Town. the 5th Badge you will get will be from your in-game Dad, Norman, the Gym Leader of Petalburg City, Normal will award you the Balance Badge after you beat him. The 6th Badge will come from Winona, the Fortree City Gym Leader, she will give you the Feather Badge. The 7th Badge will come from the Mossdeep City Gym Leaders, Tate and Liza. The 8th Gym Badge is the Rain Badge.
1st badge: The Boulder Badge, given to you by Brock, the Rock-type gym leader of Pewter City. 2nd badge: The Cascade Badge, given to you by Misty, the Water-type gym leader of Cerulean City. 3rd badge: The Thunder Badge, given to you by Lt. Surge, the Electric-type gym leader of Vermillion City. 4th badge: The Rainbow Badge, given to you by Erika, the Grass-type gym leader of Celadon City. 5th badge: The Soul Badge, given to you by Koga, the Poison-type gym leader of Fushia City. 6th badge: The Marsh Badge, given to you by Sabrina the Psychic-type gym leader of Saffron City. 7th badge: The Volcano Badge, given to you by Blaine, the Fire-type gym leader of Cinnabar Island. 8th badge: The Earth Badge, given to you by Giovanni, the Ground-type gym leader and leader of Team Rocket from Viridian City.
The sixth gym badge (the Marsh badge) is located at Saffron City's gym. It is in Gym Leader Sabrina's possession, so you have to defeat her to obtain it.
The Canalave City Gym is the 6th gym. To get there, you must Surf west from Jubilife City. Get HM03 Surf in Celestic Town.
There is no Badge in Jubilife. There is one in Oreburgh,though.
There is no Jubilife City Gym. If you mean Oreburgh City Gym, then the gym leader is in the Oreburgh Mines, and the entrance is to the very south of Oreburgh City.
Get the Orburgh City Gym Badge called "Coal Badge" then go to Jubilife city and go past the trainer school and there stands the gts building
go talk to the poketch app guy in jubilife city after getting your 3rd gym badge
the fourth gym is in celadon city at the bottom left of the city. the gym leader is erika. the badge is called the rainbow badge
To get to sunyshore, you have to get the snowpoint city gym badge.
It's located in Jubilife City, but it's guarded by an non-player character. You need to have the badge from the Oreburgh City Gym before you'll be allowed to enter.
You have to have a badge. Then go to Jubilife City.
The GTS globe is found in the Global Terminal, near the south exit of Jubilife City. You need at least 1 gym badge to access it, however.
The sixth gym is in Canalave City of Pokemon Pearl, west of Jubilife City.
In Canalive City to the west of Jubilife city!