the moveset i have fo my smeargle is:
Spore
Mind Reader
Sheer Cold
Substitute
it has only failed a few times because my opponent had a lum/ chesto berry other than that it cant fail.
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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
powerwhip wring out crunch and leech seed
SurfIce BeamRecoverHidden Power