Gen 5 Catch Rate Calculator

For Pokémon Black, White, Black 2, and White 2

Catch Chance with Different Balls

Compares the final catch probability using standard Poké Balls under the current conditions.

Poké Ball	Catch Probability

What is a {primary_keyword}?

A {primary_keyword} is a specialized tool designed for players of the Generation V Pokémon games (Black, White, Black 2, and White 2). It precisely calculates the likelihood of successfully capturing a wild Pokémon. By inputting variables such as the Pokémon’s health, its intrinsic catch rate, the type of Poké Ball used, and any active status conditions, players can strategize more effectively. Instead of guessing, you can know your exact odds, saving time, resources, and frustration. This is essential for anyone serious about completing their Pokédex, especially when hunting for rare or legendary Pokémon.

This tool is invaluable for competitive players, shiny hunters, and completionists who need to manage their inventory of Poké Balls efficiently. A common misconception is that just lowering a Pokémon’s health to red is enough. While helpful, the {primary_keyword} demonstrates how factors like using a Dusk Ball at night or inflicting sleep can dramatically increase your chances far more than just a bit of damage.

{primary_keyword} Formula and Mathematical Explanation

The core of the {primary_keyword} is the intricate capture formula introduced in Pokémon Generation V. The process involves several steps to determine the final probability.

1. Calculate Modified Catch Rate (a): This is the first crucial value. It modifies the Pokémon’s base rate based on the current battle situation.
   
   a = ( ( (3 * MaxHP - 2 * CurrentHP) * BaseRate * BallBonus ) / (3 * MaxHP) ) * StatusBonus
2. Calculate Shake Check Value (b): If ‘a’ is 255 or greater, the catch is guaranteed. Otherwise, ‘a’ is used to find ‘b’, a value that determines the success of each shake of the Poké Ball.
   
   b = 65536 / ( (255 / a) ^ 0.1875 )
3. Calculate Single Shake Probability: The value ‘b’ is compared against a random number from 0 to 65535. The chance to pass one shake is:
   
   Shake Chance = b / 65536
4. Calculate Final Catch Probability: A successful catch requires passing four consecutive shake checks. Therefore, the final probability is the single shake chance to the fourth power.
   
   Final Probability = (Shake Chance) ^ 4

Understanding this math with a {primary_keyword} is key to becoming a master trainer. For more on game mechanics, you might like our guide on {related_keywords}.

Variables Table

Variable	Meaning	Unit	Typical Range
MaxHP	The Pokémon’s maximum health points.	Points	10 – 714
CurrentHP	The Pokémon’s current health points.	Points	1 – MaxHP
BaseRate	The Pokémon’s species-specific catch rate.	Integer	3 (hardest) – 255 (easiest)
BallBonus	Multiplier from the Poké Ball used.	Multiplier	1x – 255x
StatusBonus	Multiplier from a non-volatile status condition.	Multiplier	1x (none), 1.5x (Poison/Burn/Paralyze), 2.5x (Sleep/Freeze)

Practical Examples (Real-World Use Cases)

Example 1: Catching a High-Level, Full-Health Zebstrika

Imagine you encounter a level 50 Zebstrika with 150 Max HP and full health. You toss a standard Poké Ball with no status condition.

• Inputs: Max HP=150, Current HP=150, Base Rate=75, Ball Bonus=1, Status Bonus=1.
• Calculation: The {primary_keyword} shows the modified rate ‘a’ is low.
• Output: The final catch probability is approximately 6.6%. This is a tough catch, highlighting the inefficiency of throwing a standard ball at a healthy Pokémon.

Example 2: Catching a Weakened, Sleeping Kyurem

Now, you’re facing the legendary Kyurem (Base Rate 3). You’ve skillfully reduced its HP to just 1 out of a maximum of 200. You’ve also put it to sleep and are using a Dusk Ball at night.

• Inputs: Max HP=200, Current HP=1, Base Rate=3, Ball Bonus=3.5 (Dusk Ball), Status Bonus=2.5 (Sleep).
• Calculation: Our {primary_keyword} processes these highly favorable conditions. The HP factor is maximized, and both the ball and status bonuses are significant.
• Output: The final catch probability jumps to approximately 15.6%. While still low due to Kyurem’s incredibly low base rate, this is a massive improvement and demonstrates a proper catching strategy. See our {related_keywords} guide for more legendary strategies.

How to Use This {primary_keyword} Calculator

Using this tool is straightforward. Follow these steps to get an accurate catch probability:

1. Enter HP Values: Input the Pokémon’s maximum and current HP. For best results, get the current HP as low as possible, ideally to 1 using a move like False Swipe.
2. Enter Base Catch Rate: Find the Pokémon’s base catch rate online (e.g., Bulbapedia) and enter it. This is a critical value for the {primary_keyword}.
3. Select Poké Ball: Choose the ball you are using from the dropdown menu. Consider the situation (e.g., use a Quick Ball on the first turn).
4. Select Status Condition: If the Pokémon is asleep, frozen, paralyzed, burned, or poisoned, select the appropriate status. Sleep and Freeze provide the best bonus.
5. Read the Results: The calculator instantly updates. The primary result is your final catch chance per ball. The intermediate values and charts help you understand how the result is derived.

Use the results to decide if you should keep trying with your current strategy or if you need to change tactics, perhaps by using a better ball or applying a status condition. A tool like this {primary_keyword} turns guesswork into a science.

Key Factors That Affect {primary_keyword} Results

Several factors dramatically influence your chances of catching a Pokémon. Mastering them is essential.

• Health Points (HP): This is the most direct factor you can influence. The lower the Pokémon’s current HP is relative to its maximum HP, the higher the catch rate multiplier. Bringing a Pokémon to 1 HP provides the maximum possible bonus from this factor.
• Base Catch Rate: This is an unchangeable, species-specific value. A Patrat (255) will always be easier to catch than a Reshiram (3). The {primary_keyword} is most useful for planning captures of Pokémon with low base rates.
• Poké Ball Bonus: Don’t just throw Poké Balls! Using the right ball for the situation is crucial. A Quick Ball on turn one (5x) or a Dusk Ball in a cave (3.5x) provides a massive advantage over an Ultra Ball (2x). Our {related_keywords} comparison can help you choose.
• Status Conditions: Applying a status condition is one of the best ways to improve your odds. Sleep and Freeze are the most effective, providing a 2.5x multiplier. This is often the key to capturing legendary Pokémon.
• Critical Capture: Generation V introduced the Critical Capture, a random event where the ball only shakes once and has a much higher chance of success. The probability of this happening increases as you catch more species of Pokémon. Our {primary_keyword} calculates the standard catch chance, but a Critical Capture can be a welcome surprise!
• Grass Modifiers: In Generation V, battling in dark grass can affect the catch rate, though this is a complex and minor factor not included in most standard calculators.

Frequently Asked Questions (FAQ)

1. Does the Pokémon’s level matter in Gen 5?

No, not directly. Unlike some other generations or with specific balls like the Level Ball (which isn’t in Gen 5’s main game), the Pokémon’s level itself is not a variable in the standard catch formula. However, higher-level Pokémon tend to have higher Max HP, which indirectly affects the calculation in the {primary_keyword}.

2. Is it better to use a Dusk Ball or a Timer Ball?

It depends on the turn count. A Dusk Ball provides a constant 3.5x bonus in caves or at night. A Timer Ball’s bonus increases with each turn, surpassing the Dusk Ball around turn 10. For short battles, the Dusk Ball is superior. For long, drawn-out legendary battles, the Timer Ball becomes the best option.

3. Why is the Master Ball’s bonus 255?

The Master Ball guarantees a catch. In the game’s code, setting the ball bonus to 255 ensures that the modified catch rate ‘a’ will always be 255 or greater, which is the threshold for a guaranteed capture, bypassing the shake check formula entirely. Our {primary_keyword} reflects this with a 100% chance.

4. Can a Pokémon break out of a Critical Capture?

Yes, although it’s rare. A Critical Capture greatly increases the odds of a successful catch by performing only one, much easier shake check, but it is not a 100% guarantee like a Master Ball. Failure is still possible if you’re very unlucky.

5. Does using a {primary_keyword} feel like cheating?

Not at all! It’s about playing smarter, not harder. The mechanics are part of the game’s design, and using a calculator to understand them is a sign of a dedicated and strategic player. It helps you appreciate the complexity of the game’s design.

6. What is the absolute hardest Pokémon to catch in Gen 5?

Any legendary or mythical Pokémon with a base catch rate of 3 is among the hardest. This includes Pokémon like Zekrom, Reshiram, Kyurem, and Victini. Using the {primary_keyword} is almost a necessity for capturing them without using a Master Ball.

7. Why does my catch rate seem lower than what the calculator says?

Probability can be misleading. A 15% chance doesn’t mean you’ll catch it within 7 balls. It means each ball has a 15% chance, and you could get unlucky and throw dozens of balls. The {primary_keyword} gives the statistical probability, not a guarantee. You can find more info on our {related_keywords} page.

8. Where can I find a Pokémon’s base catch rate?

Reliable Pokémon databases like Bulbapedia, Serebii, or our own {related_keywords} are the best sources. Simply search for the Pokémon to see its detailed stats, including its catch rate.

Related Tools and Internal Resources

If you found our {primary_keyword} helpful, you might be interested in these other resources:

• {related_keywords}: Calculate your Pokémon’s potential from its Individual Values. A must-have for competitive players.
• Damage Calculator: Plan your battles by calculating how much damage your moves will do.
• Shiny Chance Calculator: Understand the odds of finding a shiny Pokémon in Gen 5 with and without the Shiny Charm.