Go down from mossdeep city and when you find the deep section use dive until you see they opening if there is a submarine go in and use dive again to resurface. Enter the cave to see if there is a submarine. when you resurface go up until you reach land
beat them at their lilycove cave hideout. then go to slateport harbour. and then to the seafloor cavern
Seafloor cavern
Kyogre.
You might move boulders off of the seafloor cavern into a ship in order to examine the boulders. Often, this is accomplished using buoys that float the boulders from the seafloor to the ship.
Yeah, Kyogre's in Sapphire and Groudon's in Ruby in the sea cavern
wala
Very farefully
you can get it in seafloor cavern
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Seafloor Cavern. To get there you need surf and dive, and once in there you will need strength and rock smash. Seafloor Cavern can be found underwater in route 128.
Seafloor cavern in route 128
He is in the seafloor cavern.