yes...latias & latios but no others
you cant. You can only catch it in Pokemon emerald, but, you cant catch latias in emerald.
Yep.
No, you can only get Latias in Sapphire and Emerald and Latios in Ruby and Emerald.
It's impossible to breed latios and latias.
All of them except pre evolved Pokemon such as pichu also legendaries including latios and latias.
you have to migrate from emerald
Latias isn't in firered, it's in ruby, sapphire, and emerald.
yes
chaeat
It is not possible to breed Latias with Ditto. This is the same for all other Legendary Pokemon besides Manaphy whose egg hatches into Phione instead of another Manaphy.
No, neither Latias nor Latios are breedable.