What the capture calculation weighs
When a Poké Ball is thrown, the game evaluates several details about that encounter. A species has a built-in catch rate: common Pokémon are generally easier to catch, while rarer ones are harder. The target’s remaining health also matters. Lowering it makes a successful capture more likely, which is why moves that leave a Pokémon barely standing can be useful—though knocking it out ends the attempt.
Status conditions can help, too. Sleep and freezing have often provided a stronger capture advantage than conditions such as paralysis, poison, or burn, though the precise rules vary among games. The ball itself matters as well: different kinds of Poké Balls can improve the odds in particular situations, such as at night or against Pokémon in water.
The shake is the result, not the input
After applying the relevant modifiers, the game uses a random check to decide whether the capture succeeds. The familiar sequence of ball shakes is the visual display of that check unfolding; it is not a prompt to press a button at the right moment. Mashing A may feel like it should tip the outcome, but it does not replace the factors the game has already calculated.
That distinction changes the practical strategy. If a valuable Pokémon breaks free, the useful response is usually to improve the next attempt—reduce its health further, apply a helpful status condition, or choose a better-suited ball—rather than to press harder. The throw starts the check; preparation shapes the odds.
