The same way you got in, or use the escape rope or the move dig.
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u find it at the seafloor cavern
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.
It's in the Seafloor Cavern. To get here you need to use Dive, which is obtainable in Mosdeep City
you can get it in seafloor cavern
To open the Cave of Origin in Pokémon Emerald, you must first go underwater to the Seafloor Cavern. There you must defeat Archie.