This island is only available if you have an eon ticket.
in southern island there was latias and latios you will meet latias in Pokemon sapphire and latios in Pokemon ruby
You probably mean southern island not southern cave because southern cave does not exist, southern island is an island you can only venture to on emerald and not ruby because of the eon ticket.
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That's The Eon Ticket. It Trasports You To Southern Island.
In Pokemon Ruby, you need to Roam Hoenn. In Pokemon Sapphire, you need to visit Southern Island. In Pokemon Emerald, you need to visit Southern Island or roam Hoenn. In Pokemon Diamond, Pearl, and Platinum, you can't get it. You need to trade to get Latios.
there is no iron island in ruby
In Pokemon Omega Ruby, Latios can be found in Southern Island after obtaining the HM Surf and going to Route 123. To find Latias, you will need to get the Eon Ticket to fly to Southern Island to get her. Pokemon Alpha Sapphire has the same methods, but with the opposite Pokemon.
ok hi to get southern island you have to mix records with Pokemon ruby with eon ticket and then to emerald or a special gba event
Mirage island
From Serebii.net it seems Latias is wild in Hoenn after beating the Elite Four, and Latios can be found on Southern Island
you surf to them
wynaut