After you beat the Elite Four, go to the weather center upstairs and talk to the guy standing next to the computer all the way to the left. He will tell you about the route between Rustboro and Venduraf. Go inside the cave between those cities. when you are at Venderaf's end of the cave (near the entrance) and go tothe left and you will see another exit. Go through it and you will see a guy with black hair trying to find his glasses. I don't know where the glasses are, and you don't need to find them. go up the stairs to the north and go through the entrance there. Go to the end of that cave and then you'll find that legendary fire-ground pokemon. You can catch it with a master ball. Then go back to the weather center, talk to the guy again, go to the sea route he mentioned, and find a dark spot that's not usually there and dive in it. Keep going until you find an entrance and go up once you're in it. You'll find an underwater cavern/cave. Go to the end of it (there's no puzzles) and you will find Kyogre. Catch it with a master ball. Hope I helped. :)
not much only in sapphire you can only catch kyogre and in emerald you can catch both kyogre and groudon.
you cant
You don't
You cannot catch Kyogre native in Pokemon Diamond. You must import the mighty Kyogre from Emerald or Sapphire using Pal Park.
Yes, you can!
Get one from sapphire or emerald.
I do not know if you can catch Kyogre in Emerald but if you could, Kyogre will be in the Cave of Orgin at Sootopolis City. ;) ANSWER At marine cave, but I dont know how to get there
You have to catch Kyogre and Groudon.
no
yes yes you do
yes after beating the elite 4 you can catch both him and groudon.
you have to catch or kill kyogre