A thought came to mind regarding some Gen 6 Pokemon designs, and I noticed that three Pokemon are similar to some Sonic the Hedgehog characters/objects:
Noivern(X/Y): Silver the Hedgehog(Reason: They both have fur around their neck that is more prominent in the back)
Mega Houndoom(X/Y): Zavok(Reason: Horn shape)
Mega Metagross(ORAS): Eggman's Chaos Cannon used in Sonic Unleashed(Reason: Just see Steven's Mega Metagross use Flash Cannon in the Mega Evolution specials)
This makes me wonder if Nintendo/Game Freak took inspiration from Sonic when designing the Gen 6 Pokemon
Let me know what your speculations are. I'll compare 'em and see if they can be considered.