Where do you first meet latios in emerald?

The first way to get a LatiOS(you can also get the latias but you won't have latiOS)is to finish the game.Then when your watching the tv your mom will tell you what color it is say blue. i found my LatiOS near slateport in the water.

Lati@s can be any where in the hoen region. you can see it any where to catch it have a master ball or over 49 ultra balls kk happy lati@s hunting