If you want it to learn Thrash and Megahorn, you must do it before level 22. But then it wont learn Horn Attack(lvl 22), Helping hand(lvl 26), Fury attack(lvl 34), flatter(lvl 43) or Horn drill(lvl 53). If you dont need Thrash but want the move Megahorn you have to evolve it before level 43. Then the only moves it will miss is Flatter and Horn Drill.
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LV.58 because it learns horn drill and then evolve your nidorino intonidoking .
Nidoran{male) LV.16 to Nidorino then use Moon Stone to evolve Nidorino to Nidoking
moon stone
Nidorino Does Not Evolve By Leveling Up,You Need To Give It A Moon Stone To Evolve Into NIDOKING HOPE I HELPED
use moon stone