There is no way to return to seafloor cavern but you can still get the dinosaurs that you excavate there. After you beat the game the fossils will be spread across the islands. For example I found Megalo in white canyon in rainbow canyon's pay-to-dig site
sadly you cant, but u can find its fossils scatered around all the other areas.
You can't
You have to go to Seafloor Cavern and wear the Orange Mask.
in sea floor cavern
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.