Pokemon Catch Rate Calculator Gen 4

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Pokémon Gen 4 Catch Rate Calculator

function calculateCatchRate() { var baseCatchRate = parseFloat(document.getElementById("baseCatchRate").value); var level = parseFloat(document.getElementById("level").value); var hpCurrent = parseFloat(document.getElementById("hpCurrent").value); var hpMax = parseFloat(document.getElementById("hpMax").value); var statusCondition = parseFloat(document.getElementById("statusCondition").value); var pokeballType = parseFloat(document.getElementById("pokeballType").value); var inSpecialZone = parseFloat(document.getElementById("inSpecialZone").value); var resultElement = document.getElementById("result"); resultElement.innerHTML = ""; // Clear previous results // Input validation if (isNaN(baseCatchRate) || isNaN(level) || isNaN(hpCurrent) || isNaN(hpMax) || isNaN(statusCondition) || isNaN(pokeballType) || isNaN(inSpecialZone)) { resultElement.innerHTML = "Please enter valid numbers for all fields."; return; } if (baseCatchRate 255) { resultElement.innerHTML = "Base Catch Rate must be between 0 and 255."; return; } if (level <= 0) { resultElement.innerHTML = "Pokémon Level must be greater than 0."; return; } if (hpCurrent < 0 || hpMax = 0, Max HP > 0)."; return; } if (hpCurrent > hpMax) { resultElement.innerHTML = "Current HP cannot be greater than Max HP."; return; } if (statusCondition 2) { resultElement.innerHTML = "Status Condition must be 0, 1, or 2."; return; } if (pokeballType = 255) { catchProbability = 100; shakes = [4, 4, 4, 4]; // Always 4 shakes } else { for (var i = 0; i < 4; i++) { var shakeValue = Math.floor((256 * 65536) / Math.sqrt(((16711680 / (finalRate – i)) / 65536) / 65536)); if (shakeValue <= 65535) { shakes[i] = 1; var shakeProbability = (shakeValue / 65536) * 100; if (i === 0) catchProbability = shakeProbability; } else { shakes[i] = 0; } } } var resultHTML = "

Catch Probability Breakdown:

"; resultHTML += "Calculated Catch Value (before shakes): " + finalRate + ""; resultHTML += "Ball Modifier Used: " + pokeballType + ""; resultHTML += "Status Condition Modifier Used: " + statusMultiplier + ""; resultHTML += "Shake Status:"; resultHTML += "
    "; resultHTML += "
  • Shake 1: " + (shakes[0] === 1 ? 'Shake' : 'No Shake') + "
    • "; resultHTML += "
  • Shake 2: " + (shakes[1] === 1 ? 'Shake' : 'No Shake') + "
    • "; resultHTML += "
  • Shake 3: " + (shakes[2] === 1 ? 'Shake' : 'No Shake') + "
    • "; resultHTML += "
  • Shake 4: " + (shakes[3] === 1 ? 'Shake' : 'No Shake') + "
    • "; resultHTML += "
"; resultHTML += "Estimated Catch Probability: " + catchProbability.toFixed(2) + "%"; resultElement.innerHTML = resultHTML; }

Understanding Pokémon Catch Rates in Generation 4

Catching Pokémon is a fundamental mechanic in the Pokémon series, and in Generation 4 (Diamond, Pearl, Platinum, HeartGold, SoulSilver), the underlying mechanics for determining the success of a capture are governed by a specific formula. This calculator helps you estimate your chances of catching a Pokémon in these games.

The Catch Rate Formula in Gen 4

The catch rate is influenced by several factors, including the Pokémon's base catch rate, its current and maximum HP, its level, the status conditions it might have, the type of Poké Ball used, and whether you are in a special area that might affect capture rates.

The core calculation in Generation 4 works as follows:

  1. Initial Value Calculation: A value is derived from the Pokémon's Base Catch Rate and its HP. The formula is:
    a = (3 * MaxHP - 2 * CurrentHP) * BaseCatchRate
    b = floor(a / (3 * MaxHP)) This 'b' value represents a base effectiveness before ball modifiers and status effects are applied. Higher HP and higher base catch rates contribute to a higher 'b'.
  2. Ball Modifier: The type of Poké Ball you use significantly impacts your chances.
    • Poke Ball: 1.0x
    • Great Ball: 1.5x
    • Ultra Ball: 2.0x
    • Master Ball: 255x (effectively guarantees a catch)
      • Other special balls (like Net Ball, Dive Ball, etc.) have their own multipliers in specific situations, but for a general calculator, we often focus on the standard ones or require direct input.
  3. Status Condition Multiplier: Having a status condition on the target Pokémon increases the catch rate.
    • No Status: 1.0x
    • Sleep or Freeze: 2.0x
    • Poison, Burn, or Paralysis: 1.5x
  4. Special Zone Modifier: Certain areas or scenarios might have specific modifiers. For this calculator, we simplify this to a binary (Yes/No) input.
  5. Final Rate Calculation: The effective catch rate is then calculated by multiplying 'b' by the Ball Modifier, the Status Condition Multiplier, and any Special Zone bonus.
    EffectiveCatchRate = floor(b * BallModifier * StatusMultiplier * SpecialZoneModifier) This value is then capped at 255.
  6. Shake Probabilities: The game then simulates four "shakes" of the Poké Ball. Each shake has a probability of success determined by the Final Rate. If all four shakes succeed, the Pokémon is caught. The calculator estimates the overall probability based on these shake mechanics.

Using the Calculator

To use this calculator, you'll need to know the following information about the Pokémon you are trying to catch:

  • Base Catch Rate: This is a hidden stat for each Pokémon species. You can find these values on various Pokémon databases online (e.g., Bulbapedia, Serebii).
  • Pokémon Level: The level of the wild Pokémon.
  • Current HP & Max HP: The current and maximum HP of the wild Pokémon. Lower HP significantly increases your catch chances.
  • Status Condition: Whether the Pokémon is Asleep, Frozen, Poisoned, Burned, or Paralyzed.
  • Ball Modifier: Select the appropriate multiplier for the Poké Ball you are using.
  • In Special Zone?: Indicate if you are in a specific zone that might offer capture bonuses.

By inputting these values, the calculator will provide an estimated percentage chance of successfully capturing the Pokémon.

Example:

Let's say you're trying to catch a Level 30 Gyarados with a Base Catch Rate of 45. It has 50 out of its Max 150 HP remaining, and you've paralyzed it. You are using an Ultra Ball and are not in a special zone.

  • Base Catch Rate: 45
  • Pokémon Level: 30 (Note: Level is primarily used for wild encounters, not directly in the core catch rate formula in Gen 4, but included for context)
  • Current HP: 50
  • Max HP: 150
  • Status Condition: 2 (Paralysis)
  • Ball Modifier: 2.0 (Ultra Ball)
  • In Special Zone?: 0 (No)

Following the formula:

a = (3 * 150 - 2 * 50) * 45 = (450 - 100) * 45 = 350 * 45 = 15750

b = floor(15750 / (3 * 150)) = floor(15750 / 450) = floor(35) = 35

Status Multiplier: 1.5 (for Paralysis)

Effective Catch Rate = floor(35 * 2.0 * 1.5) = floor(105) = 105

With a Final Rate of 105, the calculator will then determine the probability of the four shakes succeeding, resulting in an estimated catch probability.

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