Yes I never wanted to use that as my argument. And I still see that you are blind and can't read or pay attention. If you watched any movie of Pokemon which i doubt you can clearly see that Ash befriended almost every legendary there. And as we know 30-40% of his Pokemon that he has weren't caught through regular battle but through making friends. And he really made "friends" with Latias and why couldn't he just ask it if it wants to come like he did with Heracross etc.? He even made friends with Celebi. But he couldn't ask it cuz of whole time traveling drama. So ye I'm saying that It's possible to catch them like that. But If you just see a legendary and attack it out of nowhere you would get owned.