Embedded Tower.
surprisingly kyogre
you need the blue orb which is only obtainable in heartgold
You can't because you can only get Groudon in SoulSilver.You would have to trade it from HeartGold to get it.
it is the same as soul silver after you get your kanto starter go to mr.pokemon and he will give you the blue orb ''kyroge is at lv.50
you have to have all 16 badges a beaten trainer red and talk to Mr Pokemon and he will give you the blue orb.
Get the Kanto Starter and show it to Mr. Pokemon. He will give you a Blue Orb in HeartGold. go to the route next to the Safari Zone Surf around till you find a tower. Catch Kyroge. The triky part in you have to show a kyroge and Gourdon to Prof. Oak. The Gourdon MUST BE FROM SOULSILVER. Action Replay wont due. Prof. Oak will Give you the Jade Orb. And BOOM Rayquaza is in the tower. its confusing.
lugia-whirlwind island ho-oh-bell tower sucuine-route 25 entei and rakoi-roaming latios-roaming(soulsilver)or pewter city from dewdrop item(heartgold) latias-roaming(heartgold)or pewter city with the dewdrop item from the mystery event(soulsilver) groundon-embedded tower(soulsilver) kyroge-embedded tower(heartgold) rayquaza-embedded tower must have a groundon and kyroge If you have any other questions go to serebii.net
Marine Cave
In water map.
Rayquaza? All you have to do is get Kyroge, then trade a Groundon from Soul Silver.... There might be an orb you need to get, but anyway. You go back to the place you got Kyroge/Groundon, and Rayquaza should be there.
Kyogre Is Not Avalible In Pokemon Ruby. Just In Pokemon Sapphire/Emerald
Sorry. You cant. You can get Groudon, though.