If you've beaten Rayquaza and bought the Southern Island Friend Area, one early morning, Latios should zoom by your house, unlocking Northern Range. After beating Latios there, you unlock Southern Valley, where you rescue Latias. Then, both Pokemon join your team.
In Pokemon Mystery Dungeon: Red Rescue Team Latias is found after you complete the 25th floor of Pitfall valley.
the last legendary in story mode is ryquaza and in free mode it is Latias
once you meet latias,latios will come kidnap her
Finish Pitfall Valley and recruit Latios Latias Finish Pitfall Valley and recruit Latios Latias
i do not know about blue rescue team but in red rescue team you have to buy southern island and do arescue next day the latios and latias event happens
you can't clone in red rescue team
Then go and recruit Latios and Latias!
you have to get friend area southern island buy it then the next morning they will come
you get both latias and latios after you beat pitfall valley.
You can't catch pokemon in red rescue team. You can battle them and they might join your team. The odds of it happening are random.
How i do to hold item in Pokemon red rescue team
try Pokemon mystery dungeon red rescue team or blue rescue team