Before saying "Mewtwo is available", as far as I know, it's a special event. Cool. But why going though all that trouble just to register it on your Pokédex?
I think legendaries should be available to anyone when they reach that certain point in the game story (or atleast, make them catchable after finishing the game story), as they're part of the game and they are part of a competitive tier.
Also, It'd be cool to hunt for a shiny Latios. :) (Wouldn't you like a Shiny Rayquaza?!)
Discuss pls.
(damn, this look like one of these noob threads, but i'm asking seriously...)