After you defeat Rayquaza and beat the "story mode", talk to Whiscash. He'll talk to you about disturbances in the ocean, and asks you to figure out the situation. After which, he'll give you the HM Dive, and Stormy Seas will be unlocked.
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-_-.................................... i think you mean surround sea
how to get it
you have to rescue scizor from crevice cave you talk to sunflora at the guild all the way down but first you have to talk to bidoof i think.................
there you dumb dumb
This person who answered last is wrong. It's Enclosed Sea I unlocked it on Sky, Surrounded Sea is where you get Kyogre, and Enclosed Sea is where you get Lugia on floor 18 only if you have a secret slab or mystery part. I accidentally deleted my old file so now I had to start over and I'm going to get it again!!
Go to the top menu and go to Wondermail S and then Password and go here to get some passwords ----> http://www.gamefaqs.com/ds/955859-pokemon-mystery-dungeon-explorers-of-sky/faqs/58573 <----.
After beating the game it becomes available for purchase at Wigglytuff's shop
u can unlock it by drinking spinda's smoothies sometimes, but it has a very low chance u can.
electric plateau is also called amp plains. if you dont have either, you unlock after the expedition.
You have to beat Skarmory first, then go south of the Pokemon Square and either talk to the Makuhita or walk in the doorway.
beat the story and go to bed with TMSurf in your toolbox and when you waike up, the mission will start. P.S unlock the southern island too