I myself am trying to catch kyogre.this is how it works.go to the weather institute,talk to the scientist who gave you the casform,he will tell u that there's somethin on route 125.next,fly to mosdeep city.cycle to the back of mosdeep city. surf then u will find a diving spot beside shoal cave. dive , then u will see a cave , enter it then dive up. u will now find kyogre...;)....GOOD LUCK AT CATCHING IT...IM ALSO DOING THE SAME THING...LOL...dont forget to save before u fight him...and bring as many ultra balls with you...im sure u can do it...
marine cave is found when you dive then you dive and look for a cave, it starts out as a a normal cave then turns into a misty one
In the cave of origin and marine cave.
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Marine cave appears if you talk to the guy at the weather institute on the top floor if he mentions a heavy rain at a certain route go there and look for a secret dive spot dive down and soon you will be in marine cave.
its in Marine Cave
Kyogre can be found in the Cave of Origins in Sapphire and the Marine Cave in Emerald.
Kyogre is in marine cave. (Beat the elite 4 first then talk to the professor in weather institute to know where Marine cave is)
In the Marine Cave. Unlike most other locations, the location of Marine Cave is not set at all, and can be determined by speaking with a man at the Weather Institute, who will explain that one route is under abnormal weather conditions. If you do not reach Marine Cave fast enough, it will temporarily disappear and Terra Cave will appear.
Marine Cave
Marine Cave.
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Island cave, Ancient Tomb, Desert Ruins, Sky Pillar, Terra cave, Marine cave, Cave of Origin.