1 Hit K-0 Moves are attacks that are guaranteed to wipe out the foe in one hit. Numerous Pokemon can learn them. These moves are:
Fissure
Guillotine
Horn Drill
Sheer Cold
Pokemon that can learn Fissure via Level-Up:
Diglett, Dugtrio, Camerupt, Trapinch, Barboach, Whiscash, Groudon, Wormadam (Sandy Cloak), Hippopotas and Hippowdon.
Pokemon that can learn Fissure via Breeding:
Lapras, Snorlax, Swinub, Piloswine, Phanpy, Donphan, Wailmer, Wailord, Torkoal, Spheal, Sealeo, Walrein, Shieldon, Bastiodon, Shellos, Gastrodon and Mamoswine.
Pokemon that can learn Guillotine via Level-Up
Krabby, Kingler, Pinsir, Gligar, Corphish, Crawdaunt and Gliscor.
Pokemon That Can learn Horn Drill via Level-Up
Nidoran, Nidorino, Rhyhorn, Rhydon, Goldeen, Seaking and Rhyperior.
Pokemon that can learn Horn Drill via Breeding:
Ponyta, Rapidash, Seel, Dewgong and Lapras.
Pokemon that can learn Sheer Cold via Level-Up
Dewgong, Lapras, Articuno, Glalie, Spheal, Sealeo, Walrein, Kyogre, Snover and Abomasnow