Trade from another game.
To find Rayquaza at the Embedded Tower you must show Professor Oak a Groudon and Kyogre caught at the Embedded Tower. The Embedded Tower is new to HeartGold and SoulSilver. In HeartGold you catch Kyogre but cannot catch Groudon and vice-versa in SoulSilver, so you must trade with someone who has SoulSilver for a Groudon then show that to Professor Oak. If the Pokemon is not caught at the Embedded Tower then it won't count.
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No.
It is not possible to get a blue orb in Pokemon Soul Silver however, you can transfer Kyogre from Heart Gold to Soul Silver to get the green orb in order to catch Rayquaza.
no, you have to trade them.
by either trading with Pokemon heart gold or Pokemon soul silver, or you can migrate from ruby, emerald, and/ or Sapphire
Rayquaza