Duskull may be a skull, but it looks harmless enough. Kind of like a cute Halloween decoration. However, descriptions of the Pokemon remind you just how scary it is. Here is how its powers and legend are described as pokemondb.net.
"DUSKULL wanders lost among the deep darkness of midnight. There is an oft-told admonishment given to misbehaving children that this POKéMON will spirit away bad children who earn scoldings from their mothers."