I should add to this.
I think they look pretty cool, but it looks funny if they are their normal colour, and then there are these random pink crystals poking out of them. You should either make a palette that has a suitable colour to match the pink crystals so you can re-colour the Pokemon you make Crystolic, or you should change the colour of the crystals themselves, rather than the Pokemon, to suit your Pokemon before attaching them. Then they would look better.
But I do really like the idea, and they do look pretty neat. Just change the colour problem.