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I have been playing the Pokémon games for a very long time, and something I've always wondered about was Critical Hits. What are Critical Hits, and how do they work?

The only thing I know about them is that they deal extra damage to your opponent's Pokémon. Does anyone know how exactly they work?

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A Critical Hit is an effect applied randomly to an attack which grants it increased damage output. Like a lot of the core mechanics of Pokemon, the way crits work have changed a lot over the years. As you are specifically asking about Generation 1 games (Pokemon Red, Blue Yellow and Green), this is how it works for those games specifically:

Probability

A critical hit occurs randomly. A number is randomly drawn from 0 to 255. This is then compared with a "threshold" value (also 0-255) that is calculated based on the factors below. If the random number is less than the threshold number, the attack is a critical hit.

Because of the way this calculation is performed - all possible values fall between 1/256 and 255/256 chance. Yes, this means it is impossible to guarantee a critical hit in Generation 1 games.

There are multiple different factors that can influence the threshold calculation (and therefore, the chances of a critical hit occurring):

  • The attacking Pokemon's Base speed - the higher the base speed of the Pokemon, the higher the chance of a critical hit. Because it uses the base speed, and not the Pokemon's calculated speed, things like stat ups and EVs do not factor in.
  • Dire Hit or Focus Energy - These are supposed to increase the chances of crits, but are actually bugged - instead, they reduce the chances of a crit occurring.
  • A move's critical hit ratio - Crabhammer, Karate Chop, Razor Leaf and Slash all have a high critical-hit ratio.

Damage

When a critical hit occurs, the attacking Pokemon's level is doubled during the damage calculation, which (approximately) doubles the damage dealt. Crits ignore all in-battle stat buffs or debuffs, meaning it's possible to land a critical hit that does less damage than a regular hit.

See Bulbapedia's breakdown of the calculation for more info.

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    Good answer. Two minor notes. 1: in Pokemon Stadium, Focus Energy works as intended and increases the crit chance. 2: The 256/256 chance is a miss (no attack at all), so whilst you can't guarantee a critical hit, you can guarantee that an attack that hits is a critical hit.
    – BGamer
    Commented Jan 24, 2021 at 6:03

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