Pokémon X and Pokémon Y

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I have totally fallen in love with this pokemon. I wonder what the shiny form will look like. I'm thinking maybe a dark green or brown like a real T-rex.

I thought there was no way to tell what color dinosaurs were. Just the texture of their skin/scales/whatever covered their flesh. Brown or green may look good on a T-rex, but there's no real way to tell.