1. Catching Nidorino and evolving it:
* Nidorino: Found in the Route 42 and Route 43 during the day.
* Evolution: Evolve Nidorino into Nidoking by trading it while holding a Moon Stone.
2. Catching a wild Nidoking:
* Goldenrod Game Corner: You can find Nidoking on the fourth floor of the Goldenrod Game Corner. However, it's very rare.
3. Breeding:
* You can breed a Nidoking with a compatible Pokemon to get Nidoran (Male) eggs. Then you can evolve Nidoran (Male) into Nidorino and then Nidoking.
Important Note:
* Nidoking is a Poison/Ground type Pokemon, making it weak to Ground, Psychic, Water, and Grass type moves.
* If you're looking for a powerful Nidoking, consider training it up and teaching it some powerful Poison, Ground, or Fighting type moves.
Good luck finding your Nidoking!