near the cavern of team aqua! rout 128!
You have to dive beside Sootopolis in different spots until you find one with an entrance, then you will find the sub. dive on route 128 and look for a cavern it should be there
How do u get through sea floor cavern on pokemon Ruby?
by having strong Pokemon
you can get it in seafloor cavern
it is at mt chimney
Nowhere it doesn't exist.
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.
Surf right from Lilycove after beating the team Magmas Base
You don't get it in Sapphire, only Ruby and Emerald
U have to go to mount pyre
go to mossdeep city and surf to the north where u will find the shoal cavern and then find a snowrunt and evolve it into a glaile
go to victory road, sky pillar, cave of origin, and the seafloor cavern.