>>28802895Ariados kinda fits the skull motif. It dropped the fake face design, but spinarak is kinda weird this gen. That being spinarak was based on an actual Hawaii endemic spider called a happy faced spider, which I guess fits the skull theme.
With all of little biology nods Gamefreak has been giving this gen I guess it was supposed to be for that purpose.
https://en.wikipedia.org/wiki/Theridion_grallator