Aww... no fair! That's the only shiny critter I've even seen, let alone captured.No, the red Gyarados you get for free in HG/SS Doesn't count.
Not true. I once caught a shiny latios in SS. It is possible. Guess luck and chance has a lot to do with it. Just gotta save and keep trying until you find it shiny.
You can't get a legit shiny Mewtoo. If you got it through trading, whomever you got it from hacked it in, and thus it is not legit. I'm nearly positive that there is currently no way to legitly get a shiny legendary pokemon.