This should have gone in simple questions.
Nidorino only evolves with a Moon Stone. You should ahve evolved the FR/LG Nidoking before level 43 so he can learn Megahorn. And Jess, nothing personal, but that moveset stinks. Thunder is bad unless you have Rain Dance since it misses so much and Horn Drill rarely works, and where's the Sludge Bomb?
~~CLOSED~~