This calculator helps you estimate the probability of successfully catching a Pokémon in Brilliant Diamond and Shining Pearl based on various in-game factors. Understanding these factors can significantly improve your chances of catching those elusive Pokémon.
None
Sleep/Freeze
Burn/Poison/Paralysis
Poké Ball
Great Ball
Ultra Ball
Net Ball (Bug/Water)
Dive Ball (Underwater)
Premier Ball
Repeat Ball (Owned)
Timer Ball (More turns)
Luxury Ball
Fast Ball (Fast Pokémon)
Level Ball (Higher Level)
Lure Ball (Fishing)
Heavy Ball (Heavier Pokémon)
Quick Ball (Start)
Dusk Ball (Night/Cave)
Friend Ball
Heal Ball
function calculateCatchRate() {
var baseCatchRate = parseFloat(document.getElementById("pokemonCatchRate").value);
var playerLevel = parseFloat(document.getElementById("level").value);
var opponentLevel = parseFloat(document.getElementById("opponentLevel").value);
var statusEffect = parseInt(document.getElementById("statusCondition").value);
var ballMultiplier = parseFloat(document.getElementById("ballType").value);
var resultDiv = document.getElementById("result");
resultDiv.innerHTML = "";
if (isNaN(baseCatchRate) || isNaN(playerLevel) || isNaN(opponentLevel)) {
resultDiv.innerHTML = "Please enter valid numbers for all fields.";
return;
}
// The core catch rate formula in Gen 4/5 (and BDSP) is complex.
// It involves calculating a 'modified catch rate' (MCR) and then
// determining how many 'rolls' are needed to catch the Pokémon.
// A simplified, commonly accepted approximation for general understanding:
var modifiedCatchRate = (baseCatchRate * (3 – (2 * opponentLevel) / (playerLevel + opponentLevel))) * ballMultiplier + statusEffect;
// Clamp the modified catch rate to prevent excessive values
if (modifiedCatchRate > 255) {
modifiedCatchRate = 255;
}
if (modifiedCatchRate < 1) {
modifiedCatchRate = 1;
}
// The actual catch formula involves rolling 16 bits.
// We'll calculate the probability of *failure* and then invert it.
// The number of 'shakes' a ball makes before either catching or failing
// depends on the modified catch rate and specific ball mechanics.
// A common approximation of catch probability based on MCR and ball shakes:
// The formula for each shake is approximately:
// P(shake_success) = (MCR / 255) * (255 – 16) / (255 – Shakes)
// Where Shakes is a value based on the MCR.
// This is still an approximation of a complex system.
// Let's simplify to a general probability formula for demonstration,
// acknowledging the actual game uses a more granular shake-based system.
// A more accurate calculation would involve simulating the 16-bit rolls.
// For simplicity, let's show a percentage based on the modified catch rate.
// The higher the modifiedCatchRate, the higher the chance.
// A simplified probability can be roughly derived from how many 'rolls'
// fall within the range needed for a catch.
// A very rough, common approximation for a single roll:
var catchProbability = (modifiedCatchRate / 255) * 100;
// Advanced approximation considering shakes (simplified):
// For a typical scenario, let's consider the general likelihood.
// The game's actual calculation involves checking if a random number
// (0-65535) is less than a calculated value based on MCR and shakes.
// Let's use a widely cited approximation of the catch chance percentage
// based on the Modified Catch Rate (MCR).
// The formula for the probability of a successful catch after 4 shakes
// (which is the most common outcome for a successful catch) is roughly:
// Chance = (MCR / 255) * (255 – 16) / (255 – Shakes)
// Where 'Shakes' itself depends on MCR.
// A simpler way to present the information is the effective 'catch value'.
// The higher this value, the better.
var effectiveCatchValue = modifiedCatchRate;
resultDiv.innerHTML = `
Pokémon's Base Catch Rate: ${baseCatchRate}
Your Pokémon's Level: ${playerLevel}
Opponent Pokémon's Level: ${opponentLevel}
Status Condition Bonus: ${statusEffect}
Ball Type Multiplier: ${ballMultiplier}xEffective Catch Value (Approximate):${effectiveCatchValue.toFixed(2)}Estimated Catch Chance (Highly Approximate):${catchProbability.toFixed(2)}%Note: The actual catch mechanics in BDSP are complex, involving multiple 'shakes' and 16-bit rolls. This calculator provides an estimation. Higher Effective Catch Values significantly increase your chances.
`;
}
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padding: 8px;
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