depends on his stats, Horn Drill is always a good move.
moveset: protect, sword dance, baton pass, substitute, any attack
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i think the best moveset for nidoking are: earthquake,sludgebomb,surf and megahorn..those are the moves that i put on my nidoking in fire red.
Hyper Beam is the best move it does 150
the best move is Draco meteor
Ninjask by far because of its speed
SurfIce BeamRecoverHidden Power