I can understand Pokémon like Clefairy - they're meant to come from space, so it's only natural they'd evolve with a Moonstone as it's also from outer space, it makes sense as far as Pokémon goes, but why Nidorina/Nidorino? They have nothing to do with outer space of anything to do with the moon. They're simply little rabbit/mouse esque Pokémon that like on Earth. Why would they need a Moonstone to evolve?
And another thing, why can't Nidoqueen or Nidoking breed? Youd've thought those would be two prime candidates for breeding
![Confused :?](./images/smilies/icon_confused.gif)