Near the 8th GYM, just surf around the 8th GYM island and find somewhere you can dive. When you are underwater, move downward until you see a invisible word. Then stay in front of the word and press B to go up, then you will found the place.
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you battle them
in team aquas hide out
You have to beat team aquas leader. His red orb will glow and kyogre will wake up.
look up walkthroughs on youtube
This may not be right but you got to go to Team Aquas hideout you will see a guy who is dressed as a part of team aqua saying jump wailmer jump you head up north to a cave which is where team Aquas hideout is. If you cant get past 2 Team Aqua goons you will have to go to slateport city where the submarine is.