>>23576415>>23575935>>23575930>>23575928>>23575546>no art of these girlsThat's because they're anime only and don't appear beyond this episode. Not to mention not everyone that plays Pokemon necessarily follows up on the anime or at least not enough to diligently push for fanart let alone draw it themselves. It's not an isolated incident, there's plenty of characters of the day in the 18 years of the anime's history that don't get fanart either.
It also helps that the 4 we know of at Valerie's dollhouse have names and one of them is brown, which makes them easier to pick out from one another.
