this depends on the under water cavern you are refering to. there is one between pacifidlog and slateport througj the currents, just stay towards the bottom of the currents. there is also one on route 128. and there is a part of the abandoned ship that goes underwater. it is located on route 108 leading towards dewford. I hope this has helped and I'm sorry if I have forgotten any.
Go to route 115 and use dive in the dark water then look for the cavern go inside then use dive again and you will appear in the cavern.
You first see it in the Slateport Harbor after meeting certain requirements, then you see it underwater in front of the Deepsea Cavern.
Left of mossdeep, below mossdeep, around sootopolis city, around seafloor cavern.
The Adamant Orb can be found underwater in Route 128 on the Sealed Cavern when diving in the middle.
How do u get through sea floor cavern on pokemon Ruby?
No you don't just go south from the 3 way underwater way thing.
Yeah, Kyogre's in Sapphire and Groudon's in Ruby in the sea cavern
You can find Maxie's Submarine in Seafloor Cavern on Route 128. From Mossdeep City, surf, and then use dive. Go all the way down till you get to the circle. go around it, an enter the underwater cavern. There, you will find the Submarine.
after you find the underwater cavern and defeat Maxie, he is in the cave of origin in sootopolis.Get lots of ultra balls because you'll want to save your master ball for latios.
you can get it in seafloor cavern
Very farefully
near the cavern of team aqua! rout 128!