you can actually catch it when you get to kanto region
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cant
sorry you have to trade it to Pokemon soul silver
you go to professor oak and he will say to get kyogre and kyogre will only appear with a silver soul and a golden heart which means that you will have to trade from heart gold
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Nothing, you'll need someone that has HG so he/she can trade to you Kyogre and with both of them you can catch Rayquaza.