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
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You must trade kyogre from sapphire or emerald to firered to obtain it.
You do not need a Pokewalker to trade Pokemon. The DS has built-in wireless communications. The DS does not need the Pokewalker to trade Pokemon.
cant
You can't. You must trade Kyogre over from Heartgold.
There is no cheat to obtain Kyogre in Pokemon Ruby. To obtain Kyogre and Pokemon Ruby, one must trade with a trainer that has obtained Kyogre in Pokemon Sapphire or Emerald.