You buy it! It is available after you finish the game but it is very expensive. Good Luck!
if you buy the southern island, go to solar cave 20F to get HM Surf then there is a cut scene in the Pokemon square plus Latios going to the Northern Range
the three islands
If your talking about Pokemon Blue Mystery Dungeon, then you have to first buy the southern island friend area. The next morning there will be a cutscene that will tell you what to do. If you mean Pokemon mystery dungeon, then you must first get the friend area "Southern Islands" from Wigglituff. Then you have to go into the square and a cut scene will tell you what you have to do.
go to a following dungeon: Sky Peak, Star Cave, Oblivion Forest, Treacherous Waters, Southeastern Islands, Inferno Cave, Zero Isle Center, and Destiny Tower. The form it is in the dungeon will wear off after the dungeon is over.
Kanto- Fire red, Leaf green, Red, Green(japan only), Blue, Gold (read above), silver (read above), Crystal (read above) Jhoto-Gold silver crystal Sinnoh- Diamond, Pearl, Platinum Hoenn- Ruby, Emerald, shapphire Orre- Colluseum and XD:gale of darkness sevvi islands- fire red leaf green (the two island from event can also be got to in emerald) battle fronteir island- Emerald only orange islands-no games set here only manga comics and movie 2000 Fiore- Pokemon ranger duelist region-Pokemon trading card game Almia- Pokemon ranger shadows of almia. mystery dungeon realm- Pokemon mystery dungeon red rescue team, Pokemon mystery dungeon blue rescue team, Pokemon mystery dungeon: explorers of time and Pokemon mystery dungeon : xplorers of drarkness games: green(Japan only), Blue, Red, Yellow, Gold, Silver, Crystal, Shapphire , ruby, Emrald,fire red , leaf green, Diamond, pearl, stadiium, stadium 2,colluseum, xd, mystery dungeon blue team, mystery dungeon red team, Ranger, battle revolution, ranger shadows of almia, Pokemon battria, hey you pikachu!, trading card game, Pokemon pinball, Pokemon snap, puzzle league, Pokemon box , Pokemon channel, pinball:ruby and shapphire, Pokemon trozei/link, my Pokemon ranch.
25 Floors Rules- -You have to go alone -Can't bring money -bring up to 8 items -pokemon can't be recruited -you have to be in master rank*** How to Unlock: get the challenge request from raikou Other- It has lots of electric-type Pokemon
use the mystery gift option use the mystery gift option
there's no blizzards islands in explorers of time that's just the name of the dungeon which happens 2 look alot like mt freeze in red rescue that's if you have mystery dungeon red rescue.. now from your explorers of time game blizzard island is on the 3rd page of your dungeons list as you leave 4 a rescue or outlaw mission from treasure town the dungeon list will pop up as you go 2 your right...veronica
you do not..
You need the mystery gift but unfortunitley if stopped years ago
go to petalburg gym and talk to the guy that asks you about your profile tell him MYSTERY EVENT IS EXITING . then activate the mystery event(after you turn off your game but after saving). then go to petalburg gym talk to your dad he well give you a EON TICKET .then you well be able to go to slateport and sail to SOUTHERN ISLANDS whenever you want.
There is no mystery pass.But there is the Aura pass and the ... pass uh i forget its name they are impossible to get without a Nintendo event but gameshark can bring you to the islands the passes can get you to.