It's impossible to get a blue orb in Soul Silver, even with a cheat code. But if it's Kyogre you want you must get from the game Heart Gold. (When Oak says:"Kyogre will only apper to not people with silver souls, but with golden hearts.") So you must have Heart Gold or a friend have it so you can trade, adding Kyogre to your Pokedex. While you have Kyogre first in your party go to Professor Oak, and he'll see you have "caughten" Kyogre. So he'll tell the rest of the Hoenn Myth, and give you an Jade Orb, that will unlock Rayquaza in the Embedded Tower.
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yensid
in pokemon heartgold after you beat red and get your 2 starters you go to mr. pokemon and he'll give you the blue orb to kyorgre
Well first I should clear up that the Red Orb is for SoulSilver, and the Blue Orb is for HeartGold, but you must defeat Red in order to get it.
Kyogre only appears in HeartGold. In order to get a Kyogre, you must trade one from HeartGold. The Blue Orb is a nice thing to have, but it only works in HeartGold.
There is not a US action replay code for the embedded tower which will work in Pokemon Silver with the blue orb.