Cool sprite and pokemon concept.=)
I like the idea of a pure ground,less defensive but more offensive onix and the sprite looks good too!
The only problem i have is that it doesn't look like a black and white sprite. It looks more like a ruby/sapphire sprite in my opinion, which is all fine and good but if your target was apparently black and white styled. You kind of missed your mark by a small bit.
4 stars :)
Grade: B+