go to sootopolis city but the door is locked to the gym so fly to mossdeep city surf down allitle there will be dark water use dive beat team aqua/magma and beat or catch kyogre/groudon and youll be able to go in the gym.
Go south of Mossdeep to where the water is darker and use dive there. Keep going south underwater and you will find the entrance to the Team Aqua hideout. You have to defeat Archie, the Team Aqua leader.
he is in stooptopolis city
If you mean "Is Juan the leader in Pokemon ruby?", then no. It's Wallace who's the leader. Juan is leader only in Pokemon emerald. The champion is Wallace in Emerald, but Steven is the champion is Ruby and Sapphire.
In sapphire you need to beat the elite 4 and in fire red you must give Celio his ruby and his sapphire. if that is already done and still no luck then i can't help you.
you have to go to the town with the first gym leader. In that big building there is a old man who will give you experience share. But first you have to do a job for him.
You head north from maville. Make sure you have Rock Smash.
The third gym leader in Pokemon Sapphire is Wattson and he is located in Mauville City.
In sapphire, the 5th gym leader is your dad, in that city after Oakdale.
You can with AR.
The leader is Falnery, she uses fire type pokemon.
The 8th Gym Leader in Pokémon Sapphire can be found in Sootopolis City.
Swampert.
he is in stooptopolis city
U can't
in lavaridge town
Sootopolis City
dark type
Pokemon leader wionda - bird and flying type Pokemon.