It depends on what game you are playing. If you're playing Sapphire leave the cave of origin and go battle Wallace the Sootopolis Gym leader. If you're playing Emerald you can go and try to catch Groudon (If you havent àlready) or you can go do whatever you want.
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you have a new Kyogre and become epic, congratulations!
catch raquaza
By either beating them or catching them.
After catching Groudon in Pokemon Soul Silver talk to Oak. He will tell you to get Kyogre. You get it by tradind of using cheats.
Well, try beating the 8th gym and the elite four. I recommend Visiting and area near Pacifidlog town called sky pillar and catching Rayquaza at level 70.