yes you can
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you need to migrate it from Pokemon diamond/pearl/platinum. it is unobtainable in soul silver/heart gold trade, not migrate
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.
by either trading with Pokemon heart gold or Pokemon soul silver, or you can migrate from ruby, emerald, and/ or Sapphire
you go back to the cave where you caught groudon/kyorge
You can try to get the other kind of orb which will get you kyogre and after you get kyogre you can go back there and get rayquaza.