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Disclaimer: While we deconstruct the Pokémon games, we do not endorse cheating which may be against Nintendo's terms of service, nor video game emulation of unauthorised video game copies, nor anything which violates technological protection measures (e.g. custom firmwares) which may be illegal. Hence readers are to make use of the information on this website at their own risk.

Welcome to the Glitch City Laboratories wiki! We are a Pokémon fansite dedicated to the various glitches and quirks of the game series.

We currently have 3,440+ pages, however we are still growing, and are in need of both new articles and further information on existing articles.

Want ideas for new content? Visit Glitch City Laboratories:Wiki tasks.


  • Major glitches — The most powerful glitches, such as those that allow you to obtain any Pokémon in the game.
  • Glitches by generation — A parent category of seven categories of Pokémon glitches by generation. Useful for looking up any particular glitch.
  • The Big HEX List — A reference table for index numbers and matching Pokémon, items, moves, characters and Game Boy ASM opcodes!
  • Reference documents — Pages not directly related to glitching, but containing info on topics such as other exploits, easter eggs, unused content, GameShark codes, in addition to how and why it all works.

More links can be found on the sidebar.


We appreciate all help for the wiki.

Before editing, we suggest that you should read our manual of style, learn what is expected of articles at GCL, and about our process for article validation.

If you are new to wiki editing, the MediaWiki help documents are a good place for information on how to edit wikis in general.


xx Emulation of Crystal's Mobile Adapter

August 17, 2019, 04:37:31 pm by Sherkel
Of special interest to those interested in game preservation should be the Game Boy Online Restoration Project's successful trade conducted using an online protocol and a software implementation of the Mobile Adapter, most famous for its use in the Japan-only version of Crystal.

As their recent tweet (complete with video footage) reads:

"For the first time in 17 years and 8 months, a trade was done with Pocket Monsters Crystal using the GTS precursor at the PCC. A shiny Gyarados was traded for a Meganium."

Additionally, hardware that would allow for online trades to be conducted in this manner is in progress. On their Discord, you can find other material such as scans and screenshots, and even talk of "DLC content" that was distributed long ago for use with the phone adapter.

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xx MediaWiki 1.32 and Editor Update

June 17, 2019, 11:56:15 am by Abwayax
The wiki has (finally) been updated to MediaWiki 1.32.

Also, VisualEditor and WikiEditor are now available, for WYSIWYG and wikitext editing, respectively. No more plain textarea!

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xx Speedrun routes on the wiki

March 25, 2019, 10:53:42 pm by Sherkel
As part of the recent restructuring we've been trying to give the site to keep it up-to-date, speedrun routes are now receiving articles. To get an idea of what advances in glitch research this series of efforts engendered, or of the depth that goes into routing, the two already completed already provide plenty of essential reading. Staying true to the site's purpose, the goal of these pages is to document in depth what's actually going on when you do those seemingly inexplicable series of inputs. Luckily, after I cluelessly dismissed the idea, our new contributor Bbbbbbbbba (with ties to pret!) went ahead and did it anyway. Speaking of which, many Generation I pages have been receiving long-overdue overhauls thanks to the aforementioned user and Luckytyphlosion.

In addition, there have been some recent updates to the German GlitchDex and Korean TMHMDex. Did you know that 기술머신49 can execute arbitrary code? Or that a counterpart to the household name 4 4 Hy exists in the German version of Yellow and learns Hyper Fang at level 205? Now you do.

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xx Void Matrix

February 26, 2019, 03:38:03 pm by Sherkel
Anyone interested in voiding and Generation IV glitches in general has probably noticed RETIRE's YouTube channel by now, but in case you haven't, it is absolutely worth checking out! Advances in exploiting the fourth generation's maps and scripts have been happening as fast as when arbitrary code execution was discovered in the first generation, and similarly accessible arbitrary code execution in this generation is a possibility on the horizon, too. Within the past six months alone, "Never tweak again", "Shaymin in 5 minutes", "Credit warp", and "Catch Arceus infinitely" have appeared in video titles. Look for yourself if you don't believe it!

Interested, but prefer real-time updates and the directness of a chat? No problem there, as there is a Discord channel dedicated solely to these, already rivaling ours in amount of activity.

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xx Recent Discoveries Roundup

November 27, 2018, 01:35:51 pm by Sherkel
There have been many groundbreaking advances in glitchology over the past few years. While most viewers know of these either through the forums, checking recent edits the wiki, or other platforms such as Pokémon Speedruns or PRAMA Initiative, they deserve a front page announcement too. I won't try to cover everything at once, as I'm likely to be missing things here and there, and the original discoverers know these exploits in greater detail, so expect a continuation of this post in the near future. With that, let's get started!

Speedrunning has provided previously unheard of incentive for glitch research, as reaching the credits without save corruption involves many possible arbitrary code execution entrypoints. The most recently discovered one in this category, currently a required step in all "race to the Hall of Fame" runs, is the Red/Blue Viridian Forest D618 script. The previous "no save corruption" route involved very calculated use of Move 0x00 corruption (the "Cooltrainer move" we've known about for over ten years!), never previously so thoroughly documented. Those looking to "catch 'em all" also need to learn the LOL glitch in addition to its many variants. Ever wanted to throw a Master Ball out of battle and catch whatever you wanted with it? Now you can!

However, not only were glitched runs affected by advances in research; glitchless ones were too, thanks to the discovery of luck manipulation mechanics! Forms of this exist in all games and were mandatory skills for competitive players in Generations IV and V; however, its discovery in Generation I led to greater attention being given to the accuracy of emulators, as due to instructions passed from the BIOS to the ROM, none of the existing ones worked the same way as a console until these discoveries, giving us forks of emulators such as Dabomstew's Gambatte-Speedrun, in addition to updates to BGB.

Generation IV research has undergone startling advancements this past year.

Not only did GCL's Cryo discover a way to finally obtain the Hall of Origin Arceus via the void glitch, but the aptly-named RETIRE also found a way to change the location Arceus is located! If you've ever felt like the real place Sinnoh was birthed was the Veilstone Department Store or the Hearthome Contest Hall, as we all have at some point or another, watch this.

Various other discoveries by these two can be found in the forums' Generation IV section. The RETIRE trick itself is a central part of many of these new exploits.

Saving the best for last, it turns out tweaking itself has been obsoleted, thanks to RETIRE's Union Room Wrongwarp! The thread and video explain it best; go check them out! Navigating through Sinnoh has never been easier.

Speaking of which, did you think Generation I had the only games where you could change tiles at will to trigger whichever event you wanted? That's not quite correct anymore.

Returning to work done by the GCL crew, Torchickens has been working on a brand new MetascriptDex, which seeks to point out highlights within the countless sets of instructions the Generation I games run through meta-map script activation, those being parent scripts for each map in Kanto. To get a clearer idea of what that all means, have a look at any of the contents (the aforementioned Viridian Forest exploit is among them.)

Thanks to the tremendous efforts of coloradohugge and Torchickens, we now have expanded the GlitchDex to include species from games in regions overseas! (Psst: This includes the leaked Gold and Silver demos!)

Finally, massive thanks to everyone involved with making these discoveries and explaining them to the public. We understand the GCL Wiki has much to catch up on as PSR continues chugging along, and have been internally discussing what to do about the heavily-outdated layout and article organization. Rest assured, glitchology itself is still alive and kicking. Whether we know you or not, any contributions to the wiki are both appreciated and encouraged!

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