The Run and Bun Calculator Extension is a Chrome add-on designed to improve the user experience of the existing Run and Bun calculator for Pokémon. This free tool calculates and displays priority scores for enemy AI Pokémon, which are not included in the default version of the calculator. By leveraging available information on the web page, the extension provides clear and concise damage outputs with priority scores, helping players make more informed decisions during gameplay.

With the extension enabled, users can see additional details alongside the standard damage calculations. For instance, damage outputs for moves like Dazzling Gleam and Aqua Jet now include priority score ranges, enhancing strategic planning. This functionality is particularly useful for competitive players looking to optimize their Pokémon battle strategies by understanding the potential impacts of move priorities.