One-hit knockout move
One-hit knockout moves, commonly abbreviated as OHKO moves, are moves that, when used, cause the target's HP to drop to 0 no matter what their stats are. They are all especially inaccurate, given that their effect is to completely decimate the opponent, as to have them much more accurate would further encourage their use to quickly and easily finish battles.
When used, they will always fail if the level of the target is higher than the level of the user, except in Generation I, where they would fail if the user's Speed stat was lower than the opponent's.
All one-hit knockout moves have 30% accuracy and a base of 5 PP. Pokémon with the ability Sturdy are unaffected by all of them, unless the user has the ability Mold Breaker. Pokémon also holding the item, Focus Sash, are not entirely affected as it leaves the user with only 1 HP, due to Focus Sash's effect.
So far, there are four OHKO moves:
| Move | Type | Generation introduced |
|---|---|---|
| Fissure | 
|
I |
| Guillotine | 
| |
| Horn Drill | ||
| Sheer Cold | 
|
III |
Trivia
- Due to the presence of these moves, Articuno has been used in many battles as it can also learn Mind Reader to make Sheer Cold sure to hit.
- The same was true of a Poliwrath traded forward from Generation I that had learned Fissure, and could learn Mind Reader in Generation II.
- Lapras can learn three of these moves: Sheer Cold, Fissure, and Horn Drill.
- Before Generation III introduced Sheer Cold, all of these moves could not affect specific Pokémon. (Guillotine/Horn Drill could not affect Ghost Pokémon, and Fissure could not affect Flying Pokémon.)
- For Wi-Fi battles, under Standard Rules, these moves are forbidden. This is commonly called OHKO Clause or simply 'No OHKO moves'.