As usual, SJWs are fucking exceptional individuals that only see the world through their Western Culture Blinders.
Jynx has nothing to do with blackface. Its look is based on a creature from Japanese folklore, as well as the "ganguro" fashion trend that started in Japan around the time Pokemon debuted there (which in itself was a protest against the cultural expectation of Japanese women to have pale, white skin).
Since there are very few black people in Japan, there was no such thing as black slaves, Jim Crow laws, or minstrel shows in Japan, so they have no context for blackface in the first place. Only people as arrogant as SJWs have taken it upon themselves to tell another race what their culture really meant and how civilized whiteys like them can show the backwards neanderthals how the thing they've been doing for thousands of years is problematic.