In the bay
Go to the submarine and press B. You'll notice you can get up there. If you are above, you'll need to explore a cave with team aqua in it.
After you find the submarine you use dive up to the surface.
You get it from the cave where Team Aqua has taken the submarine to
in the back of the base, but they get away with it.
it is in team aqua's base (the one where they had the submarine)
You can find them in the underwater cavern
At a cave under water in route 128 :)
you will find team aqua in the under water cavern near the dive point in sootopolis
Get it back. People shouldn't steal.
You have to go to Solopotis where u have to use dive to go up the submarine is there
Team Aqua/Magma took it underwater. Dive a look around for a secret entrance underwater and go in it. You will see the submarine. Then one you are at the sub, go up to the surface above it and defeat team Aqua/Magma.
go to the team aqua's stole submarine and use dive.