Its called southern island i hope it helped.
southern island
You buy his friend area that has eon Pokemon visit it from Wigglytuff. Then you wait and one morning get Latios and Latias.
The ultimate dungeon is purity forest and you can get to it by savin latias from pitfall valley
Spacial rift 12f
Buy the friend area that says Eon Pokemon visit here often then wait till one morning they come passed. I'm still waiting for Latios and Latias to come.
you have to get friend area southern island buy it then the next morning they will come
Up ur bottom third floor to the right
go to buried relic
In Pokemon Mystery Dungeon: Red Rescue Team Latias is found after you complete the 25th floor of Pitfall valley.
cause i said so...
recruit latios and latias, to recruit them complete soar cave and have Southern island friend area acquired
once you meet latias,latios will come kidnap her