You can't. Legionaries can't have eggs.
Latias is a legendary pokemon, so you cant get an egg from either latias or latios, even though they have genders.
If you're asking if you can get an egg for Latios or Latias without breeding them, then the answer is no; you cannot get an Egg for either of them without hacking the game.
latias dosent evolve cus its a legendary Pokemon
no
No
No, Latias and Latios cannot have an egg together because they are both legendary Pokémon.
No
go to the egg and latios/latias will come to you
No, you can't. Latios and Latias do not belong to an egg group. An egg group exists for breeding and without one, it cannot breed. Conventially no legendaries are in an egg group, but Manaphy can breed and create Phione.
you get: if you picked red (latias), you get a latios egg and the opposite
No, because it has a No Egg group.
No, Legendaries except for manaphy cannot lay eggs