After defeating the Elite Four, go to the Weather Institute and talk to the professor on the second floor. He will say there is a heavy rainfall in a certain route. Get to that route. There must be any place to dive that was not there before. Dive and get to Kyogre. After you catch Kyogre, go to the weather institute and talk again to the professor on the second floor. This time the route he will say will be on land. Get to the certain route. There has to be a cave that was not before. Get inside the cave and find Groudon.
you beat Archie on emerald
You can't get Kyogre in Pokemon Ruby but you can get Kyogre in Pokemon emerald and sapphire and in ruby you only get groudon and rayquaza. In sapphire you get Kyogre and rayquaza and in emerald you can get groudon, Kyogre, and Rayquaza.
groudon,kyogre,rayquaza
Sootopolis City
You don't
There are many legendary Pokemon in emerald, such as groudon, rayquaza, groudon, deoxys, and such. Groudon and Kyogre are not available until after beating Wallace, but Rayquaza can be caught right after the major battle between groudon and kyogre.
In what game? In Ruby, Groudon is n Cave of Origin, before Rayquaza In Sapphire, Kyogre replaces Groudon. In Emerald, Groudon is in Terra Cave and Kyogre, Marine Cave.
No, you need to get Ruby. Or you can get Emerald where you can get both Kyogre and Groudon, including Rayquaza.
You battle Kyogre for your chance to capture it in Pokemon Alpha Sapphire after you capture the groudon.
sootopolis city
Kyogre,Groudon, raquaza, Latias and (or) Latios
Rayquaza, Kyogre, and Groudon