tip: Try cloning to get a whole bunch of master balls. Its easier!
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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.
Once you defeat Groudon, you can't battle him again. It's either you catch him the first time or don't.
First become Pokemon champion then go to the weather institute which is placed southwest of fortee city go to the top and talk to the scientist he tells you of a drought or a heavy downpour on a certain route depending on the weather condition you can find a secret cave on the route he mentions which leads to kyogre and groudon.
First its Groudon. When You Beat The Elite Four You Go To The Weather Instetute (Est of fortree) Then Talk To The Guy Upstairs Then He Will Tell you a route like 127 But you can catch Kyorge to. If Its Gordon ( A Pokemon I Never Heard Of Then This Is A Bad Anser Just Telling You Ok) ^_^
There are two ways of getting Groudon on Pokemon Diamond. The First way is trade it with people in the GTS (Global Trade Station). Or you can migrate it from Pokemon Emerald, Ruby, or Sapphire.