Sturdy

The Pokémon cannot be knocked out by a single hit as long as its HP is full. One-hit KO moves will also fail to knock it out.

When this Pokémon is at full HP, any hit that would knock it out will instead leave it with 1 HP. Regardless of its current HP, it is also immune to the one-hit KO moves: Fissure, Guillotine, Horn Drill, and Sheer Cold. If this Pokémon is holding a Focus Sash, this ability takes precedence and the item will not be consumed.

48 Pokémon have it

Geodude Alolan Geodude Graveler Alolan Graveler Golem Alolan Golem Magnemite Magneton Onix Sudowoodo Pineco Forretress Steelix Shuckle Skarmory Donphan Nosepass Aron Lairon Aggron Relicanthhidden ability Regirockhidden ability Shieldon Bastiodon Bonsly Magnezone Probopass Roggenrola Boldore Gigalith Sawk Dwebble Crustle Tirtouga Carracosta Tyrunthidden ability Carbinkhidden ability Bergmitehidden ability Avalugghidden ability Hisuian Avalugghidden ability Togedemaruhidden ability Totem Togedemaruhidden ability Cosmoem Nacli Naclstack Garganacl Cornerstone Mask Ogerpon Archaludon