And this Chespin! OMG! I saw the pic link thingy on the side and just. This! That is Chespin. Indubitably and without doubt. I was wishy washy about Chespin but this is awesome! You are totally one of the Deviantartists that should totally cover all the Pokemon (Arvalis being another, but Vkyla has an excellent Togi series)!
These sort of interpretations and drawings of pokemon is why I still enjoy playing the games. It might sound weird, but its true. No matter how dorky the pokemon looks in the game, when i see other images of them then that is how i picture them to really be and it makes the games more enjoyable.
Judging by its name (particularly the japanese one) it's likely themed by hedgehogs and possibly porcupines (though they're rather distantly related in reality).
Personally I got more of a ferret like vibe in the design which i brought a little bit of into this, but I tried to go more for a more realistic... chespin more so than trying to turn chespin into some real pre-existing species (like a hedgehog/mole/chipmonk/ferret/otter/padgolin/badger/ancient mammal what have you). I think part of the charm of him is that his species is so indescript and so wanted to keep a bit of that, playing on what i thought were more defining parts of his design (such as his rather round face with little snout).
Yup, if you want to play it you're going to have to get a 3DS or a 3DS XL. Got to have some way to get people to buy new handhelds! I bet its working though, since I'm contemplating it (since I don't have a 3DS). Hh nintendo, always making me buy new things...