Search Mamoswine.org
Interactive Battle Tool

Shiny Odds Calculator

Compute exact binomial probabilities of finding a shiny Swinub across wild encounters, breeding, and mass outbreaks.

Hunting Method & Attempts

Quick Sample Counts:
Binomial Probability • Precise Formula
Chance of at least 1 Shiny Swinub
63.2%

Individual Roll Rate: 8/4096 (1/512)

How to Use the Shiny Odds Calculator

  1. Select Input Criteria: Adjust the dropdowns, sliders, or numerical fields on the left control panel to match your current in-game situation.
  2. Live Instant Calculation: The application automatically executes the official Generation IX battle formulas in real time without refreshing the page.
  3. Analyze Strategy & Benchmarks: Examine the computed output panels, check key defensive or damage thresholds, and use the results to optimize your team.
  4. Share or Bookmark Your State: Use the browser's address bar link, which updates dynamically with your chosen parameters so you can bookmark or share your build with friends.

Mathematical Formulas & Engine Mechanics

Probability of >= 1 Shiny in N Encounters: P = 1 - (1 - p)^N, where p is the per-encounter probability (e.g. 1/4096 base, 1/1365.33 with Shiny Charm, 1/682.67 with Masuda, 1/512 with both).

Our calculations strictly follow the official Generation IX game logic implemented by Game Freak in Pokémon Scarlet and Violet. All numbers use integer floor functions at every step rather than standard floating-point rounding, ensuring that min-max damage ranges, stat benchmarks, and multiplier thresholds match in-game tournament hardware precisely.

Worked Battle Examples with Real Numbers

Masuda Method + Shiny Charm (p = 1/512)

Inputs: Method: Masuda + Charm, Eggs: 512

Result: P = 1 - (511/512)^512 = 63.2% chance of finding at least one shiny Swinub.

Wild Hunting with Charm (p = 1/1365)

Inputs: Method: Wild + Charm, Encounters: 1,000

Result: P = 1 - (1364/1365)^1000 = 51.9% chance of at least one shiny.

Frequently Asked Questions (Shiny Odds Calculator)

What color is Shiny Mamoswine?

Shiny Mamoswine replaces its dark brown fur with a striking olive-green coat, while retaining its ice-blue facial markings.

What is the base shiny rate in Generation IX?

Since Generation VI (X/Y), the base shiny encounter rate is 1 in 4,096 (prior to Gen 6, it was 1 in 8,192).

What does the Masuda Method do?

Breeding two Pokémon originating from games with different language tags gives 5 additional shiny roll attempts, raising odds to approximately 1 in 683 (or 1 in 512 with Shiny Charm).

Does reaching 512 eggs guarantee a shiny?

No. Probability does not accumulate linearly. At 512 eggs with 1/512 odds, you have a 63.2% chance of having seen at least one shiny. To reach 95% confidence, approximately 1,532 eggs are required.

Data Engine: Pokémon Gen 9 (Patch 3.0.1) • Verified via Smogon & Bulbapedia Last Engine Audit: September 2026 Pokémon and Pokémon character names are trademarks of Nintendo. Mamoswine.org is an independent fan project.