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how 2 get in the under warter cave on Pokemon emerald
In the cave of origin and marine cave.
A person can find the underwater cave in Pokémon Emerald in the Seafloor Cavern. It is found after defeating Team Aqua in MossDeep.
route 228
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
its in Marine Cave
go to route 127 and 128,then go underwater.
Marine Cave
Marine Cave.
The cool thing about emerald is that you can get 2 kyogres in the game: One in the cave of origin the other in marine cave.
Kyogre can be found in the Cave of Origins in Sapphire and the Marine Cave in Emerald.
In the underwater cave, use dive (B button) to come to the surface. You end up in Sootoplits City. Hope this was helpful ;)