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Pokémon battle simulator.
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chat-plugins Info: Add Doubles Ubers and update Doubles UU
config Mix and Mega: Fix multiple Blue Orbs
data Fix Taunt duration on targets switched in during the turn
dev-tools/jscs-custom-rules JSCS: fix crash in validateConditionals rule for empty blocks
lib Some cleanup in /modlog
logs standardize "Pokémon" in .md files
mods Gen I: Fix fast asleep message showing every sleep turn
static Changes to static file serving
test Merge pull request #1999 from ascriptmaster/move-fixes
tournaments Chain Room#update to Room#[add|addRaw] everywhere
.gitignore Introduce cache for syntax testing.
.travis.yml Introduce cache for syntax testing.
LICENSE License: Update copyright year to include 2015 Update challstr protocol
Procfile Make Procfile specify Heroku's desired port Credits: Fix order
app.js Chain Room#update to Room#[add|addRaw] everywhere
battle-engine.js Merge pull request #1999 from ascriptmaster/move-fixes
cidr.js More style fixes and Gulpfile updates
command-parser.js Use .id instead of .filename in uncacheTree
commands.js Add # for users being able to declare in /declarehelp
crashlogger.js Dependant support: make sure that relative paths are resolved properly
dnsbl.js Refactor Dnsbl.reverse
gulpfile.js Gulpfile: add tasks `clear` and `learnsets`
loginserver.js Timeout errors should have a stack trace too.
old-simulator-doc.txt Update "Pokemon" to "Pokémon" in old-simulator-doc.txt file
package.json Update dev dependencies
repl.js Apply 4222ffb to repl.js
rooms.js Room#add and Room#addRaw now return the room
simulator-doc.txt Remove [InterruptMove]
simulator.js Slightly more console output
sockets.js Add diagnostic for obscure crash
team-validator.js Add crash guard to team validator
tools.js Fix formats getting corrupted if loaded as rules from different mods
users.js Matchmaking: handle each format independently
verifier.js Dependant support: make sure that relative paths are resolved properly

Pokémon Showdown

Navigation: Website | Server repository | Client repository

Build Status Dependency Status devDependency Status


This is the source code for the game server of Pokémon Showdown, a website for Pokémon battling. Pokémon Showdown simulates singles, doubles and triples battles in all the games out so far (Generations 1 through 6).

This repository contains the files needed to set up your own Pokémon Showdown server. Note that to set up a server, you'll also need a server computer.

You can use your own computer as a server, but for other people to connect to your computer, you'll need to expose a port (default is 8000 but you can choose a different one) to connect to, which sometimes requires port forwarding (note that this isn't possible on certain internet connections).


Pokémon Showdown requires you to have io.js installed, any version. (Alternatively, you can install node.js version 0.10.2 or later.)

Next, obtain a copy of Pokémon Showdown. If you're reading this outside of GitHub, you've probably already done this. If you're reading this in GitHub, there's a "Clone" button in the bottom of the right sidebar, or if you're really lazy, there's a "ZIP" download button. I recommend the Clone method - it's more time-consuming to set up, but much easier to update.

Pokémon Showdown is installed and run using a command line. In Mac OS X, open Terminal (it's in Utilities). In Windows, open Command Prompt (type cmd into the Start menu and it should be the first result). Type this into the command line:


Replace LOCATION with the location Pokémon Showdown is in (ending up with, for instance, cd "~/Downloads/Pokemon-Showdown" or cd "C:\Users\Bob\Downloads\Pokemon-Showdown\").

This will set your command line's location to Pokémon Showdown's folder. You'll have to do this each time you open a command line to run commands for Pokémon Showdown.

To install dependencies, run the command:

npm install --production

Copy config/config-example.js into config/config.js, and edit as you please.

Congratulations, you're done setting up Pokémon Showdown.

Now, to start Pokémon Showdown, run the command:

node app.js

You can also specify a port:

node app.js 8000

Visit your server at http://SERVER:8000

Replace SERVER with your server domain or IP. Replace 8000 with your port if it's not 8000 (the default port).

Yes, you can test even if you are behind a NAT without port forwarding: http://localhost:8000 will connect to your local machine. Some browser setups might prevent this sort of connection, however (NoScript, for instance). If you can't get connecting locally to work in Firefox, try Chrome.

You will be redirected to The reason your server is visited through is to make it more difficult for servers to see a user's password in any form, by handling logins globally. You can embed this in an iframe in your website if the URL is a big deal with you.

If you truly want to host the client yourself, there is a repository for the Pokémon Showdown Client. It's not recommended for beginners, though.

Setting up an Administrator account

Once your server is up, you probably want to make yourself an Administrator (~) on it.


To become an Administrator, create a file named config/usergroups.csv containing


Replace USER with the username that you would like to become an Administrator. Do not put a space between the comma and the tilde.

This username must be registered. If you do not have a registered account, you can create one using the Register button in the settings menu (it looks like a gear) in the upper-right of Pokémon Showdown.

Once you're an administrator, you can promote/demote others easily with the /admin, /leader, /mod, etc commands.

Browser support

Pokémon Showdown currently supports, in order of preference:

  • Chrome
  • Firefox
  • Safari
  • Chrome/Firefox/Safari for various mobile devices
  • Opera
  • Firefox for Android
  • IE9+

IE8 support can technically be added without too much difficulty, but it doesn't run PS fast enough to be usable.

As for older browsers (Firefox 3.6), I won't go out of my way to support them, but if there's a simple fix, you can suggest it to me and I'll implement it.


PS has a built-in chat service. Join our main server to talk to us!

You can also visit the Pokémon Showdown forums for discussion and help.


Pokémon Showdown's server is distributed under the terms of the MIT License.



  • Guangcong Luo [Zarel] - Development, Design


  • Hugh Gordon [V4] - Research (game mechanics), Development
  • Juanma Serrano [Joim] - Development
  • Leonardo Julca [Slayer95] - Development
  • [The Immortal] - Development

Retired Staff

  • Bill Meltsner [bmelts] - Development
  • Cathy J. Fitzpatrick [cathyjf] - Development


  • Andrew Goodsell [Zracknel] - Art (battle weather backdrops)
  • Ben Davies [Morfent] - Development
  • Ben Frengley [TalkTakesTime] - Development
  • Cody Thompson [Rising_Dusk] - Development
  • Jacob Zimmer [SolarisFox] - Development
  • Kevin Lau [Ascriptmaster] - Development
  • Konrad Borowski [xfix] - Development
  • Kyle Dove [Kyle_Dove] - Art (battle backdrops)
  • Mathieu Dias-Martins [Marty-D] - Research (game mechanics), Development
  • Quinton Lee [sirDonovan] - Development
  • Robin Vandenbrande [Quinella] - Development
  • Samuel Teo [Yilx] - Art (main background)
  • Vivian Zou [Vtas] - Art (alternate main background)
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