Unfortunately, Nidoking doesn't learn Horn Drill at all. In order to have your Nidoking learn Horn Drill, you'll need to level up your Nidorino to level 46 (you learn Horn Drill at that level) and then evolve it into a Nidoking.
In Pokémon White 2, the moves that Excadrill is capable of learning would include ones such as Mud Sport, Scratch, Mud-slap, Rapid Spin, Metal Claw, Dig, Fury Swipes, Slash, Hone Claws, Horn Drill, Rock Slide, Earthquake Sandstorm, Swords Dance, Fissure and Drill Run.
37.
yES! Aggron does learn horn drill. Get it At the move tutor at fallarbor town (you give hi a heart scale in exchange)
It should, my Nidoking still has it.
Nidorino Learns Horn Drill at level Level 53 but that is only in firered/leafgreen have you got a specific game?
Nidoking doesn't learn Horn Drill by level. Its previous evolution, Nidorino, does, which learns it at level 46. You'll have to level up a Nidorino until it learns Horn Drill, then evolve it to Nidoking.
Various Pokemon in the Pokemon series are capable of learning the move horn drill. For example, there is Rhydon or Rhydon.
Bulbapedia has full movelists for all Pokémon.Here's its list for Exeggutor in Fire Red/Leaf Green.http://bulbapedia.bulbagarden.net/wiki/Exeggutor_(Pok%C3%A9mon)/Generation_III_learnset
It learns Fissure at level 62.
Rhyperior can learn very powerful moves like Mega Horn, Rock Wrecker, and Horn Drill (a 1-hit KO move).
horn drill is not a TM in Pokemon platinum.