Duskull

Duskull can pass through any wall no matter how thick it may be. Once this Pokémon chooses a target, it will doggedly pursue the intended victim until the break of dawn.

Downloaded from The Models Resource, slightly retopologized and smoothed, and split apart for easier printing and painting. I recommend not trying to print and paint this in one piece. It's far easier to print the mask separately, paint it, and then attach it to the body.

You can also substitute an appropriately-sized ball