Go to Route 128 and find some dark spots in the water. From there, use Dive. It should look like underwater canyons that stretch out for awhile. Explore around until you find a cave entrance. Once in, you should see a stolen submarine. Use dive there again to surface. Good luck
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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.
To open the Cave of Origin in Pokémon Emerald, you must first go underwater to the Seafloor Cavern. There you must defeat Archie.
they are in a underwater cavern in route 128, but be carfull make a wrong turn and you will be sent back to the begining and you also battle the leader
how 2 get in the under warter cave on Pokemon emerald
u find it at the seafloor cavern