Guides:TimoVM's gen 2 ACE setups

This is a guide on how to execute and/or exploit a glitch. For a more technical overview of the glitch involved, see Arbitrary code execution.

Arbitrary Code Execution (ACE) is the use of glitches to force the game to execute custom code written by the player. This gives the player near-complete control of the game, allowing the following uses:

• Add any pokémon, regardless of version.
• Add any item to the item bag.
• Freely edit pokémon data, including giving a pokémon any move, editing stat experience and editing DVs to obtain shiny pokémon.
• Experiment with more complex behaviour, such as walking through walls or adding a run function.
• For Virtual Console versions, transfer pokémon that could otherwise not be transferred like Mew, the full Treecko line and Torchic.
• And many more uses.

This page provides ACE setups for every single language/version release of gen 2. All setups are tested to be compatible for both original cartridge and virtual console releases. Alongside that, they should work on most (decently accurate) emulators.

What does this set of guides install?

This set of guides will guide you through the process of setting up ACE for any language version of Gold, Silver or Crystal:

1. How to obtain an initial ACE setup.
2. Using that initial ACE setup, install a small mail writer program that allows quick installation of more complicated programs and scripts.
3. Provide several useful scripts and programs that can be used in combination with the mail writer.

ACE for Gold and Silver can be set up after reaching Goldenrod City, requiring at least two badges. ACE for Crystal can be set up after reaching Violet City, requiring zero badges.

Obtaining initial ACE setups

The following are guides that allows a faster setup on Pokémon Gold & Silver (from Violet City onwards instead of Goldenrod City). The drawback is that these are more technical to perform compared to the guides in the next table.

Game	Applicable language	Link
Gold & Silver	English	Glitch Pokédex Mode ACE setup
	French	Glitch Pokédex Mode ACE setup (FR)
	German	Glitch Pokédex Mode ACE setup (DE)
	Italian	Glitch Pokédex Mode ACE setup
	Spanish
	Japanese	Glitch Pokédex Mode ACE setup (JP)

The following are guides that allows a faster and easier setup on Pokémon Crystal (from Cherrygrove City onwards instead of Violet City)

Game	Applicable language	Link
Crystal	English	Fast 0x1500 ACE
	French	Fast 0x1500 ACE (FR and DE)
	German
	Italian	Fast 0x1500 ACE
	Spanish

The following are a finished collection of older guides that are suitable for all users.

Game	Applicable language	Link
Gold & Silver	English	Coin Case ACE
	French	Wrong Pocket TM ACE (non-EN)
	German
	Italian
	Spanish
	Japanese	Wrong Pocket TM ACE (JP)
	Korean	Wrong Pocket TM ACE (KOR)
Crystal	English	0x1500 Control Code ACE
	French
	German
	Italian
	Spanish
	Japanese	0x1500 Control Code ACE (JP)

Installing the mail writer to easily set up arbitrary payloads

Game	Applicable language	Link
Gold & Silver	English	Mail Writer GS (EN)
	French	Mail Writer GS (non-EN)
	German
	Italian
	Spanish
	Japanese	Mail writer GS (JP)
	Korean	Mail writer GS (KOR)
Crystal	English	Mail writer C
	French
	German
	Italian
	Spanish
	Japanese	Mail writer C (JP)

Mail writer applications

After setting up the mail writer, you can browse through the pages linked below that details the various applications. Versions of the included codes have been made for all versions and all languages.

Mail codes

Using the mail writer, you can easily write and execute small codes with various effects. The page itself offers a selection of preconfigured codes that can be immediately used once the RAM writer has been set up and require little prior knowledge to effectively use.

Mail Writer Codes

RAM writers

The RAM writer is a complex program that allow you to both read from and write to memory using a simple graphical user interface. The programs linked on the page are quite large (between 288 and 320 bytes in size), requiring a bit of time to set up and are most useful for players who have some technical knowledge. In return, the RAM writer can be used at any time and offers a high flexibility in writing and executing custom payloads.

RAM Writer

Acknowledgements

• This collection of guides wouldn't have been possible without the setups and programs written by flag3833753 and other members of the JP glitching community, most of which could be easily adapted to other versions.
• Thanks to Crystal_'s earlier contributions on setups for Gold/Silver, along with working out advanced box name code application.
• Thanks to TheZZAZZGlitch for demonstrating efficient ways to program a RAM writer program.
• Thanks to LuckyTyphlosion for working out rough guides on how to abuse 0x1500 ACE on Crystal.
• Thanks to the members of the Glitch City Research Institute discord for providing valuable support and feedback.
• Thanks to Scotteh for providing invaluable help in the development of the mail code converter tool.
• Thanks for Trent and Retire for proofreading the full set of guides.