GO to sandgem town and then go up. go west than north and east and bnorth and west and the n Jublife City wuill come our. U need to vese some trainers.
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cross the water to the west of jubilife
Jubilife city. go to the left of the Pokemon trainers school.
Jubilife City is located in Sinnoh, not Hoenn. Since Pokemon Sapphire takes place in Hoenn, Jubilife City is not accesible. You can buy a copy of Diamond, Pearl or Platinum in which travel through Sinnoh.
Get to Jubilife City, obtain the Poketch, and then take the route to the left all the way.
The orange dots on the Town Map are just there to show you where you recently came from. For example, if you used Fly from Jubilife City to Eterna City, the dots would be on Jubilife City.