Juan is only in emerald.
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.
Sootopolis city.
There isn't one. GTS was introduced in GenIV, Ruby is GenIII. You'll have to make do with face-to-face trades
You get it in Sootopolis city. If your playing Ruby or Sapphire. You would be fighting Wallace. In Emerald, You fight Juan.
no theres not the only thing you can do with Pokemon ruby, sapphire,emreald, firered and leafgreen is you can migrate Pokemon on there but you can never get them back on uroringil ame like ruby and sapphire and so on
because they are now face the fact
Juan is a gym leader in Sootlopolis City. To get there, you have to use dive. Wallace will be the champion. In ruby and sapphire, Wallace will be gym leader and Steven will be champion.
Pokemon ruby's version IS Pokemon ruby.
Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.
Emerald: He is the champion of the Elite Four; Juan is the Sootopolis gym leader. Sapphire/Ruby: He is the gym leader of Sootopolis.
ruby
he is in the museum upstairs you should heal your Pokemon because you have to face two magma grunts once you talk to him.