Pretty sure Jynx was based on the Ganguro fad that was HUGE in 90s Japan.
Bleach blonde hair, pastel lip gloss, extremely darkened skin. That's the definition of Ganguro.
Still an atrocious design that still doesn't fit with any of the existing pokemon. Plus I feel if Nintendo's initial design was purely based of Ganguro they wouldn't have buckled and changed her design without putting up any fight. Honestly though, only the designers know whether it's based on blackface or Ganguro or pure stereotypes.
I swear when I first saw this pokemon and its evolution I almost wanted to cry at the stupidity of it. I mean seriously! I can handle an ice cream cone pokemon, even a candle pokemon (I actually don't mind either and like litwick). But a trash bag? Cmon you guys...