First you have to beat the elite 4. After you do that you go to the weather institute and talk to the man on the second floor. He will tell you where you can find kyogre and after you catch him go back to the weather institute and talk to that same man this time he will tell you where groudon is.
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you can`t catch kyogre or groudon or both of them without linking them from sapphire, ruby or emerald version.
its on route 115 but you have to have kyogre,groudon and rayquaza
Yes, You can catch Groudon in Pokemon Emerald.
kyogre rayquaza and groudon
catch raquaza