(My entry for Thimble's scary pokemon contest.)
Due to being human long ago, it has memories of being a human. The mask it carries is the face of the human it once was. Sometimes, it looks at the mask and cries, apparently in longing. If someone wears the mask, they will become possessed by the Yamask in question. (this is actually canon stuff guys)
#TDspookypkmn #2spooky #pokemon #yamask