If you very carefully lower Kyogre's health to near zero, it will be much easier to catch. (I'm sure this is common sense anyway...) Ultra balls and perhaps repeat balls will make Kyogre easier for you to catch. I would suggest using the Master ball anyways, it's much easier (Unless you've already used it.) If you did use it, prepare for a lot of wasted Pokeballs...
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you have to be either sixth or seventh you dont need a masterball to catch him
you can, the catch is fairly easy even without a masterball although I woul use ultra balls if you arent going to use a masterball. I you knock out reshiram without sAVing before hand you can try again after the credits at dragonspiral tower
you can`t catch kyogre or groudon or both of them without linking them from sapphire, ruby or emerald version.
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
Use a masterball,parilize it,constently huck balls at it,damage it.