You must confront Groudon in the Cave of Origin.
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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.
You get it in Sootopolis city. If your playing Ruby or Sapphire. You would be fighting Wallace. In Emerald, You fight Juan.
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.
No trainer in the game has relicanth in ruby but you can find it around sootopolis city underwater.
you have to break all of the tiles and stairs will appear