- Nidoking and its female counterpart Nidoqueen share their category name with Rhydon and Rhyperior. They are all known as the Drill Pokémon. Additionally, all four are partly Ground types.
- Although its female counterpart Nidoqueen cannot be bred, Nidoking can.
- Nidoqueen and Nidoking are the only Pokémon with a Poison/Ground type combination.
- Nidoking is a popular choice with anime rivals as both of Ash's main rivals (Gary and Paul) have one as well as Jimmy's main rival.