you have too have dive. when you have it surf too the biggest patch off the dark water and use dive. find the cave opening and once your inside us dive
The final hideout is between Sootopoolis and Mossdeep. Use dive when you see the sub.
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
north east of lilycove
it is at mt chimney
by having strong Pokemon
near the cavern of team aqua! rout 128!
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
just walk in front of the stone when you have there emblem
You use it to get groundon activated
there is no sub. only on Pokemon sapphiere and emerald. you have to defeat Team Magma, not Team Aqua.