I've always had a concept for alternate final form in the Nidoking line. What if in the past – before moon stones became into play, the nidoran line had a different final evolution. A form called Nidosaur. Basically it would be a bit larger, thinner ,slicker more lizard like version of Nidoking. It would be a DRAGON /poison type and would focus on speed and attack. I feel like trainers in the past would rarely obtain a Nidosaur. Due to them being a bit difficult to achieve. They would need to constantly train their Nidorino and form a close bond with them. But the other reason why would be that their more violent to their enemies. Reports from the past would show that a Nidosaur almost killed a trainer if their partner didn't stop them. But as moon stones arrived, people would use them more for a more controllable pokémon. As such, the alternate evolution would be lost. But strong will trainer's can try to gain one. In game – if your friendship is high with your Nidorino and they reach level 47-you would get a Nidosaur.
by Zillaman7980