Southern island does exist but only with an Action Reply or a GameShark.
Other than that it doesn't unless you have a Eon ticket that works.
.:SAVE BEFORE YOU TALK TO THE LADY:.
Just in case.
To get to southern island you need to have the Eon Ticket which can be Obtained
With a Cheating Device or through a Event.
When you have the Ticket you go to LilyCove to the Harbor and talk to the Lady.
If she say's the same thing as all the time then the ticket didn't work and thus you need to activate it with a cheating device.
If it works she will say "Oh...that ticket" and she will walk into the Ship and out will come the Sailor and he will talk to you about an island know as Southern island and that he can take you there so you will go there.
When you get there just walk up to the entrance to the forest whatever it is.
In there you will see a Small Rock sorta egg shape and go to it and press "A".
.:SAVE BEFORE YOU PRESS THE "A" ON THE ROCK:.
Then you will hear a noise and down will come Latios if you have Sapphire and if you have Ruby down will come Latias and then you batttle them I think there Level 50 when you fight them there.
If you have an AR or GS and you have the Code to keep In-countering them you in the same spot.So if you have it on and you fight and capture the Latios or the Latias then press the "A" again on the rock and another one will come down.
I did this and I also had the Shiny Code on so I caught a bunch of Shiny Latios and traded them to people.
So yeah thats pretty much that.
Added by: TwilightPrince Jan 25th 2008, ID#11723