Gourwak wear a mask that grows constantly, so they carry a carving knife made out of bone to adjust the holes in their mask. Without the carving knife, the holes in their mask would close and render them unable to see.
A Gourwak is the evolved form of a Cubone that has grown tough by overcoming the grief of losing its mother. Singing in eerie voices, they wander town streets on the night of the new moon.