The best replacement for nidoking is rhydon.

The best alternatives to nidoking are rated as following:
★★★★★  rhydon
★★★★★  nidoqueen
★★★  nidoqueen yellow
★★  tyranitar
★★  dugtrio
★★  dragonite
★★  snorlax fire red
★★  golem
★  machamp
★  gengar
★  snorlax
★  rhyperior
★  sandslash
★  nidoqueen leaf green
★  aerodactyl
★  vileplume
★  primeape
★  toxicroak
★  clefable
  muk
  nidoqueen better
  graveler
  marowak
  mamoswine
  nidoqueen fire red

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