Gen 5 Catch Rate Calculator

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

Catch Results

Formula Used: The final catch probability is calculated based on several factors including HP, base catch rate, ball bonus, and status. It involves a modified rate ‘a’ and a subsequent shake probability. In Gen 5, four successful “shake checks” are required for a successful capture.

Probability Table (Current HP & Status)

Poké Ball	Bonus	Catch Chance

Comparison of catch probabilities using different Poké Balls under the current conditions.

Catch Rate vs. HP Chart

What is a Gen 5 Catch Rate Calculator?

A gen 5 catch rate calculator is a specialized tool designed for players of Pokémon Black, White, Black 2, and White 2. It computes the precise probability of successfully capturing a wild Pokémon. Unlike general-purpose calculators, a gen 5 catch rate calculator uses the specific mathematical formula unique to the Unova region games. This formula accounts for several variables, including the Pokémon’s health, its intrinsic catch rate, the type of Poké Ball used, any status conditions like sleep or paralysis, and unique Gen 5 mechanics like Capture Powers from the Entralink.

This tool is invaluable for competitive players, shiny hunters, and anyone looking to optimize their strategy. Instead of guessing or relying on luck, you can make informed decisions, such as whether to use a valuable Dusk Ball or to spend more turns lowering a Pokémon’s HP. Common misconceptions are that all generations share the same formula or that simply getting a Pokémon to red health is enough; however, the math, as demonstrated by this gen 5 catch rate calculator, is far more nuanced.

Gen 5 Catch Rate Calculator: Formula and Mathematical Explanation

The core of the gen 5 catch rate calculator is a two-step process involving a modified catch rate (let’s call it ‘a’) and a shake check value (‘b’). The game then performs four of these “shake checks” to determine if the Pokémon is caught. Here’s how the Unova catch mechanics work.

Step 1: Calculating the Modified Catch Rate (a)

The first value, ‘a’, is determined by the following formula:

a = (((3 * MaxHP - 2 * CurrentHP) * BaseRate * BallBonus) / (3 * MaxHP)) * StatusBonus * CapturePower

This formula, a cornerstone of the gen 5 catch rate calculator, combines all the primary factors into a single number. If ‘a’ is 255 or greater, the catch is guaranteed. If not, it’s used in the next step. Understanding how to calculate catch rate gen 5 is key to success.

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 species’ intrinsic catch rate.	1-255 scale	3 (Legendaries) – 255 (Common)
BallBonus	Multiplier from the Poké Ball used.	Multiplier (x)	1x – 5x
StatusBonus	Multiplier from a status condition.	Multiplier (x)	1x (None), 1.5x (Paralyze), 2.5x (Sleep)
CapturePower	Multiplier from Entralink Pass Powers.	Multiplier (x)	1x – 2x

Step 2: The Shake Check Formula and Final Probability

Once ‘a’ is known, the game calculates a value ‘b’, which determines the success of each of the four required shakes.

b = 65536 / (255 / a)^0.1875

The probability of passing a single shake is `P(shake) = b / 65536`. Since four successful shakes are needed, the final probability of a catch is:

P(Catch) = (P(shake))^4

This multi-step process is what makes a dedicated gen 5 catch rate calculator so useful, as it handles the complex exponents and variables instantly, including the intricate shake check formula.

Practical Examples (Real-World Use Cases)

Example 1: Catching a Legendary Pokémon (Kyurem)

Imagine you’re facing a Level 75 Kyurem in the Giant Chasm. Kyurem has a Max HP of 200, a very low Base Catch Rate of 3, and you’ve whittled it down to 1 HP (using False Swipe) and put it to sleep.

• Inputs: Max HP=200, Current HP=1, Base Rate=3, Ball=Dusk Ball (3.5x bonus in a cave), Status=Sleep (2.5x bonus).
• Calculation: The ‘a’ value would be high due to the low HP and high bonuses. Our gen 5 catch rate calculator would process this.
• Output: The calculator shows a catch probability of approximately 15.4% per Dusk Ball. This tells you that while not guaranteed, you have a decent chance, and it’s worth using your valuable apriballs.

Example 2: Catching a Common Pokémon (Patrat) on Turn 1

You encounter a full-health, Level 4 Patrat (Max HP=18, Base Rate=255) at the start of a battle and decide to use a Quick Ball.

• Inputs: Max HP=18, Current HP=18, Base Rate=255, Ball=Quick Ball (5x bonus on turn 1), Status=None.
• Calculation: Even with full health, the extremely high Base Rate and Quick Ball bonus create a high ‘a’ value. The ‘a’ value calculated is `(((3*18 – 2*18) * 255 * 5) / (3*18)) * 1` which equals `(18 * 1275) / 54 = 425`.
• Output: Since the ‘a’ value (425) is greater than 255, the gen 5 catch rate calculator confirms a 100% guaranteed catch. This demonstrates the power of the Quick Ball on common Pokémon.

How to Use This Gen 5 Catch Rate Calculator

Using this gen 5 catch rate calculator is straightforward. Follow these steps to get an accurate catch probability:

1. Enter Pokémon HP: Input the target’s Max HP and its Current HP. For the best odds, Current HP should be 1.
2. Set Base Catch Rate: Find the Pokémon’s base rate online (e.g., Bulbapedia) and enter it. This is crucial for accuracy.
3. Choose Your Ball: Select the Poké Ball you intend to use from the dropdown menu. The calculator will apply the correct bonus.
4. Apply Status Condition: If the Pokémon is asleep, paralyzed, etc., select the condition to apply the corresponding multiplier.
5. Add Capture Power: If you have an active Pokémon capture power from the Entralink, select the appropriate level.
6. Read the Results: The calculator instantly displays your overall catch probability. Use the table and chart to compare how different balls or more damage could affect your odds. This helps in understanding the Unova catch mechanics better.

Key Factors That Affect Gen 5 Catch Rate Results

Several key factors influence the outcome of your capture attempt. Understanding them is essential for any serious trainer using a gen 5 catch rate calculator.

• Remaining HP: This is the most significant factor you can control. The lower the Pokémon’s HP, the higher the ‘a’ value, and thus the higher the catch chance. A Pokémon at 1 HP is vastly easier to catch than one at 50% health.
• Status Conditions: Inflicting a status condition is critical. Sleep and Freeze provide a massive 2.5x bonus to the formula, making them the best options for difficult captures.
• Poké Ball Choice: Don’t just throw Ultra Balls. Using the right ball for the situation—like a Dusk Ball in a cave or a Quick Ball on turn one—provides a much larger bonus and can save you resources.
• Base Catch Rate: This is an unchangeable property of the Pokémon species. A legendary with a catch rate of 3 will always be exponentially harder to catch than a common Pokémon with a rate of 255.
• Capture Power: This unique Gen 5 mechanic offers a powerful boost. Activating a Capture Power Lv. 3 can double your final ‘a’ value, effectively making every ball twice as good. It’s a key part of the Pokémon Black and White catch rate strategy.
• Critical Capture: Gen 5 introduced the Critical Capture, a random event where the ball only shakes once and has a much higher chance of success. The chance of this happening increases with the number of Pokémon you’ve registered in your Pokédex. Our gen 5 catch rate calculator focuses on the base probability, but a Critical Capture can be a welcome bonus.

Frequently Asked Questions (FAQ)

1. Does the Pokémon’s level matter in the gen 5 catch rate calculator?

Generally, no. The Pokémon’s level is not a direct variable in the main catch formula, with one exception: the Nest Ball, which is more effective on lower-level Pokémon. Our calculator includes a level input specifically for this ball.

2. Is there a difference between Paralysis, Burn, and Poison?

No. In terms of catch rate, all three of these non-volatile status conditions provide the same 1.5x bonus. Only Sleep and Freeze provide the superior 2.5x bonus.

3. What is a “shake check” and why are there four?

A shake check is an internal calculation the game performs. After calculating the ‘a’ and ‘b’ values, the game generates four random numbers. If each of those numbers is lower than ‘b’, the Pokémon is caught. Each successful check corresponds to one shake of the Poké Ball you see on screen.

4. Why does this gen 5 catch rate calculator show a 100% chance sometimes?

If the calculated modified rate ‘a’ is 255 or higher, the game skips the shake checks entirely and guarantees the capture. This often happens with common Pokémon or when using highly effective balls like the Quick Ball on turn 1.

5. Does using a higher-level Pokémon to battle increase my catch rate?

No, your Pokémon’s level has no effect on the catch rate formula, except when using the Level Ball, which was not available in Gen 5 standard gameplay but follows a similar principle.

6. How does the Dark Grass modifier work?

In Gen 5, battling in the dark, rustling grass where double battles can occur applies a modifier to the catch rate based on your Pokédex completion. Early in the game, this modifier actually makes Pokémon harder to catch, encouraging you to fill your Pokédex first. This is an advanced variable not included in this calculator for simplicity.

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

It depends on the turn count. A Dusk Ball provides a constant 3.5x bonus in a cave or at night. A Timer Ball starts at 1x and its bonus increases each turn, surpassing the Dusk Ball after about 10 turns. Our gen 5 catch rate calculator helps you compare these scenarios.

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

Reliable Pokémon databases like Bulbapedia, Serebii, or our own linked Pokémon Type Chart page are excellent resources. Simply search for the Pokémon to find its stats, including its base catch rate.

Related Tools and Internal Resources

If you found our gen 5 catch rate calculator helpful, check out these other resources to enhance your Pokémon journey:

• Pokémon IV Calculator: Discover the hidden potential of your Pokémon by calculating their Individual Values.
• Shiny Hunting Odds Calculator: Plan your shiny hunts by understanding the probabilities with and without the Shiny Charm.
• EV Training Guide: A comprehensive guide to Effort Value training to maximize your Pokémon’s stats for competitive battles.
• Pokémon Type Chart: A complete and easy-to-read chart of all type matchups for strategic battling.
• Pokémon GO PvP Stats: Analyze the best Pokémon and movesets for success in Pokémon GO’s PvP leagues.
• Pokémon Legacy Move List: A list of rare and no-longer-obtainable moves for collectors and traders.