after you see groudon for the first time but only see it. i no this isn't very helpfull, but ask the question "How do i catch groudon in Pokemon ruby" or ask "Where and how to catch groudon in Pokemon ruby"
In Pokemon Ruby, Wallace is the gym leader of Sootopolis City. When the player first arrives in the city, Wallace is not at the gym. He and Steven are north of the city. They take the player to the Cave of Origin where Groudon is encountered. After this battle, Wallace can be found and battled in the Sootopolis Gym.
He is the sootopolis city gym leader.
where just about always is,the sootopolis gym.
In Emerald, he is the Pokemon league champion. In Ruby and Sapphire, he is Sootopolis's gym leader.
Talk to one of the people in Sootopolis City (can't remember which one... Maxie? Steven? Wallace?) and they will get the guy to move out of the way.
Wallace is the Gym Leader of Sootopolis City so you will be able to verse him once you challenge the Gym.
You get it in Sootopolis city. If your playing Ruby or Sapphire. You would be fighting Wallace. In Emerald, You fight Juan.
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.
I'm sorry to say it, but "that guy" is not a Pokemon. He is, however, the leader of the Sootopolis Gym. In Ruby and Sapphire, he was Wallace. But in Pokemon Emerald, he became Juan. Wallace then became the Elite Four Champion.
It's because on Pokemon Ruby and Sapphire, Steven is the league champion and on Pokemon Emerald Wallace is the champion instead of the final Gym Leader. Juan doesn't exist on Ruby or Sapphire.