Earlier this week on October 12th there was a special day with a highly increased spawn of female Pokémon. I didn't know about it until the day itself as I had not opened my app in the Eeveening on the

  Despite its pre-evolution Nidoran♀ and Nidorina's male counterpart Nidorino being able to breed, Nidorina and its evolution Nidoqueen are unable to breed.  This also makes Nidorina and Nidoqueen