Pokémon Showdown is a battle simulator that provides a website for Pokémon battling, a JavaScript library for simulating battles and accessing Pokédex data, command-line tools, a web API, and a game server for hosting custom communities.
The tool simulates singles, doubles, and triples battles across all nine generations of Pokémon games. It solves the problem of needing an accessible, programmable way to run Pokémon battles without requiring the official games. The simulator handles the complex mechanics of each generation and exposes this functionality through multiple interfaces: a playable website, a JavaScript library for developers, command-line utilities for non-JavaScript programs, and a server that communities can self-host with custom game modes.
Pokémon Showdown suits developers building bots, battle analysis tools, or custom Pokémon communities. The project provides substantial documentation including protocol specifications, architecture overviews, and a bot FAQ to help new developers understand how to integrate with or extend the simulator. Self-hosting the server is straightforward for those wanting to run their own instance rather than using the public website.
The project maintains active engagement with its user base, with nearly all open issues coming from outside users rather than the core team, demonstrating substantial real-world adoption. Maintainers typically respond to new issues and pull requests within a day. Work in the issue tracker centers on bug fixes, enhancements, and client-related improvements.
