>>58913752Best in what context? Competitively or in-game?
Nidoking is an absolute beast in-game because of early game acquisition + early moon stone evolution + godlike special coverage + horn drill/x accuracy shenanigans, but he's garbage competitively because 85 speed isn't going to outspeed anything remotely fast, 75 special means its coverage will be underwhelming, even when super-effective, and poison/ground is a legitimately dreadful defensive type, being weak to psychic, ice, ground and water, while only being immune to electric without even resisting normal.
On the other hand, Rhydon is pretty good completely because it single-handedly shuts down Zapdos, it has an absolutely massive 130 attack + stab earthquake, and it can switch in some resisted moves like hyper beam and explosion because it resists them. However, in-game, Rhydon is terrible because of late safari zone acquisition, it evolves at level 42, its level up moveset is absolute trash, making it overreliant on tms, there are no relevant electric trainers after the point you can get it, its special is bad, and it's very slow, so Lorelei will just fucking destroy you.