you can migrate him from emerald or sapphire.
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yes
You can't. You must trade Kyogre over from Heartgold.
The cool legendaries you can get in Soulsilver/heartgold are the following: Lugia, Ho-oh, Raikou, Entei, Suicune, Articuno, Moltres, Zapdos, Mewtwo, Latias, Latios (Latios in Soulsilver & Latias in Heartgold), Kyogre, Groudon, Rayquaza (Kyogre in Heartgold, Groudon in Soulsilver & Rayquaza if you have both).
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.
You can't :/ you can only get a Groudon on SS, You get the Kyogre on HG . Which if you get a kyogre from HG take it with your Groudon to Mr.Pokemon then you can catch Rayquaza :) i know that why i said without trading