I don't think it'll be Grass. Possible of course, but despite the fact its in a forest, it doesn't physically give a "grassy" impression.
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Not a Grass type, all of which so far have very distinct grass / leaf / flower / thorn / seed thing going as a clear indication :P
I know what you mean though. I probably never would have guessed Palkia as Water. I did say it was still possible in my post, I just highly doubt it will be, unless he turns out to be the first "Palkia of Grass types".
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Psychic/Fighting. I've been saying it from the beginning and I'll keep on saying it, though I can see Psychic/Dark and Psychic/Steel as possibilities as well. For those who can't see where the Steel possibility comes from, it's primarily based on the idea that he might have blades of some kind for feet.
Everybody's stuck on Grass, but I really, really don't see it happening. Grass really isn't a viable type for a big mascot legendary like this, and just because it's a stag doesn't make it Grass by default. Though colors aren't always the most reliable indicator, I do think the bigger hints here are the multicolored antlers and the blue/black color scheme...but only time will tell.
Not that I'm particularly "for" this being the case, but I actually saw a pretty decent argument on reddit for Xerneas and Yveltal having "light" and "sound" types. Xerneas's horns do glow, and if what everyone's assuming is right and Yveltal is blind, it kinda bolsters the sound-type theory as well.
It would also be an interesting direction to take the series since they're already being innovative and making the game full 3D.
EDIT: If not sound, then I could see Psychic/Electric.
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