t doesn't evolve by level use a moon stone
Nidoran evolves when he or she reaches level 16.
Nidoran evolves at Level 16.
Nidoran Female and Male both evolve at Level 16.
It evolves at level 16
Nidoran evolves on level 65.
Omanyte evolves at Lv.40 in heartgold.
Quilava evolves at level 36
sentret evolves at level 20 in Pokemon heartgold
it evolves from pineco at level 31
It evolves at level 36.
it evolves at level 36
There are two versions of Nidoran, depending on gender: Nidoran♀ and Nidoran♂. Nidoran♀ evolves into Nidorina starting at level 16, and then Nidorina evolves into Nidoqueen using a Moon Stone. Nidoran♂ evolves into Nidorino starting at level 16, and then Nidorino evolves into Nidoking using a Moon Stone. Nidoran♀ is #29 in the National Pokedex, and Nidoran♂ is number 32. They were both introduced in the Generation I Pokemon titles (Red, Blue, and Yellow) where they could be found on Route 22 and in the Safari Zone (and additional places in Yellow). In Generation VI (X and Y), they can both be found on Route 11.