I dunno.thats just how the game creators made it.
NIDORAN evolves into NIDORINO and it evolves into NIDOKING. It is a great Pokemon infact i am training one, good luck.
Are you talking about female or male nidoran? In what Pokemon they evolve, it depends on what nidoran you catch(since the two nidorans are different). First of all, both male and female nidoran evolves, at level 16(). Both of them evolves to Nidorin@. Euh, now comes the thing that you need to remember- when either male or female nidoran evolves, you need to give ti a moon stone to get its last evolved form- if you give it to Nidorin@, you will get either Nidoking or Nidoqueen, depending on Nidorin@'s gender.
Nidoran{male) LV.16 to Nidorino then use Moon Stone to evolve Nidorino to Nidoking
i know you can catch these: chansey, nidorino nidoran male nidorina, nidoran female and eggsegcute
trade a nidoran male from firered or leafgreen to sapphire then evolve it at level 16.
Male and female Nidoran evolve at level 16. Male into Nidorino and Female into Nidorina. Both need a Moon Stone to evolve into Nidoking and Nidoqueen respectively.
Both Nidoran, female and male, evolve at level 16. Then you get Nidorina and Nidorino. To get Nidoqueen and Nidoking you use the Moonstone, which are really easy to get.
Nidoran evolves into either Nidorino (Male) or Nidorina (Female) at level 16, and then both of them go on later to evolve into Nidoking (Male) and Nidoqueen (Female) Using a Moon stone.
You can get nidorino by training a nidoran male(purple colour) to level 16 or catching it in the safari zone.
First train a nidoran male to level 18 then use a moon stone on nidorino you will evolve it to nidoking.
Nidoking does not evolve, he is a 3rd tier pokemon. the evolution series for nidoking is as follows: Nidoran(male) + lvl 16 = nidorino. Nidorino + moon stone = Nidoking. Nidoking will not evolve any further.
There is a lot: Nidoran male, Nidorino, Nidoran female, Nidorina, Chansey, Scyther, Horsea, Goldeen, Psyduck, Dratini, Magikarp, Paras, Parasect, Exeggcute, Tauros, Kangaskhan, Venonat, Venomoth, Doduo.