You to dive under water and find the cave, that leads to sootopolis city. Im pretty sure it's on route 229. But if you just surf, and then dive down from mossdeep. And it is in the middle of a big dark ring in the ocean.
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In mossdeep city you have to go two houses next to the gym and get TM dive by steven go on the black part around sootopolis and use dive.
you have to use surf and go to sootopolis city from lilycove. then dive down and find the underwater cave.
you have to learn dive first beat the twins then get dive go on you way to sootopolis and when you see dark spots in the water use divethat's how you get into sootopolis
Go to the route near sootopolis city and use dive u should see a cave go inside and the submarine should be there
you get it at cave of origin but you have to beat the gym leader of sootopolis city to use it on the waterfall to ever grande city