You can't. You go do whatever you want in Lily-cove City. Some Wailmer's are blocking the sea's entrance. Then go to the OUTSIDE top of Mt. Pyre. The boss is there, steals an Orb, then the old lady gives you the last Orb. fly to Slate-port City, talk to Capon. Stern, then go inside to talk to the boss. He runs away, then go back to Lily-cove city, and the Wailmer's are gone
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go to Lillycove city and then go right to the beach and surf up and then you go into the cave entrance and its really the entrance to team aquas hideout!
You have to beat team aquas leader. His red orb will glow and kyogre will wake up.
you battle them
in team aquas hide out
You will find the boss after you see the all the galactic people in the heardqarters the boss will be talking. after that follow you guy up and there is the boss! gl