Well, you'll have to wait and see of course.
I figured somebody would say that, which is why I included a link to the page about the basilisk. try reading it, it sounds just like Giratina. And most legendaries are based on something or another. (Example: Moltres/Ho-oh = Pheonix)
Well I always see Giratina as 'The Elephant caterpillar from Hell!'.
And Caterpillar's change pretty fast, so anything is possible.
say i'm sure people have heard of that possible new version of D/P game, maybe the giratina form will be in there.
Giratina ultra evil chicken form? Why its found in Kanto's torn world of course! But seriously that sounds badass. Roar I am giratina giant chicken lizard!
It could be, but how it will look like? maybe a "chicken" giratina as some in thread have said, but anyway, how and when it will appear?