This page serves as a repository for methods to quickly set up advanced ACE setups, starting from SRAM glitch. These methods can be used for the French, German, Italian and Spanish releases of Yellow. It is part of the TimoVM's Gen 1 ACE setups set of guides.

The methods described here were heavily inspired by previous SRAM glitch setups developed by Evie (Chickasaurus GL), as well existing setups intended to be used for the Japanese releases.

Please make sure to fully read every step of the guide before executing them.

If you encounter any issues when going through this guide or would like to provide feedback, please contact TimoVM on the Glitch City Research Institute Discord.

Setting up initial ACE

When you use UP + SELECT + B on the title screen, the game will delete the save by filling the entirety of SRAM with $FF values. When you then interrupt the very first save process with specific timing, you can create a glitched save file that has a party consisting of 255 ($FF) pokémon. This is known as "SRAM glitch".

Within this glitched state, we can abuse the expanded party to affect memory areas that are normally unrelated to the party, with a wide variety of possible effects. In this guide, we will be abusing this to set up an ACE environment through the following process:

Set up SRAM glitch
Using SRAM glitch, access Celadon City so that we can assemble an item code that will allow us to write code using boxed pokémon's nicknames.
Using an exploit known as "Map Script ACE", set up a method to quickly pick up an unlimited amount of Eevees
Write code by repeatedly picking up and nicknaming Eevees. This will be used to build a program that allows you to more easily write arbitrary code.

Note: setting up ACE on an existing save

While this guide is built with new saves in mind, the method itself is inherently compatible with existing saves that fulfill the following criteria:

Must have reached Celadon City.
Must be able to use Fly and have a party pokémon that has learned Fly.
Must have set up the Expanded item pack. It is recommended to deposit all important items to the PC prior to setting up the expanded item pack.

Once you have all of these requirements, you can continue the guide from step 4 onward.

Step 1: Starting a new game and setting up SRAM glitch

First, we need to set up SRAM glitch.

Clear all saved data by pressing UP + SELECT + B on the title screen and confirming that you want to erase all saved data. (This needs to be done even if no save data is present).
Start up the game and go through the intro. Name your character and rival any name you want.
Open the start menu, and select "Save".
Select "Yes" in the "Yes/No" dialog box, but at a very precise moment, power off or reset the console.
- Soft resetting (holding Start+Select+A+B) will not work, as the game prevents soft resets while it is saving.
- The timing to power off or reset is after the "Yes/No" dialog box has disappeared, but before the text changes to "Now saving..." (Red/Blue) or "Saving..." (Yellow).
  - The time window between those two visual cues is around 20 frames (depending somewhat on the version and the circumstances), but the window to successfully perform this glitch is only 4 frames.
Reload the game. If you can continue the game and can open the pokémon menu, you have successfully set up SRAM glitch and can continue with the guide. Otherwise, repeat the process from the start, erasing the save in the process.

A quick note on the effects of SRAM glitch

Thanks to clearing out the previous save using UP + SELECT + B, which fills saved data with $FF values, we will reload with a party consisting of 255 ($FF) pokémon. There are, however, quite a number of side effects due to this:

Having 255 party pokémon makes us unable to enter battle without heavy side effects. Due to this, we will be avoiding battle completely.
It is heavily recommended to not look at the summary of any of the party pokémon, since they are made up of glitched data.
Thanks to having 255 party pokémon, we are able to swap pokémon beyond the 6th party slot.
Every few steps, the game will act as if at least one party pokémon is poisoned. This effect can be freely ignored.

Throughout the guide, codes are provided that resolve these side effects and allow you to resume normal game progression.

A quick note regarding unterminated name items

Certain glitch items lack a proper string terminator. When you select them, either by pressing A or select when highlighting them in the bag, these items will crash the game. On the Virtual Console releases, this has a possibility of erasing your save. When you see any item with an unusually long glitched name, please make sure to not use either of these buttons to select them.

In certain maps, such as Celadon City, opening the item bag or scrolling the item bag to display an unterminated name item will cause the game to seemingly freeze. You can cause the game to safely resume by tapping b regularly until the game continues.

In the Celadon City map, unterminated name items can be made safe to handle as long as at least one tree is visible on the upper row of the map while the start screen is opened. Under these circumstances, unterminated name items can be safely selected with a or select. This will also ensure that you do not need to tap b multiple times in order to scroll through unterminated name items, but certain items may still require a single b press to scroll through.

During the guide, care is taken to ensure that we'll only stand on these safe spots when using the item bag.

Step 2: Reaching Celadon City

The main item code will be assembled in Celadon City. We will be abusing the extended party's properties to obtain an expanded item pack. The expanded item pack is a glitched state where the game thinks that we have 255 ($FF) items in the item pocket, even though the item pocket usually has a maximum size of only 20 items. This allows us to access areas of memory beyond the item pack and treat them as if they are items. We will be abusing this to warp directly to Celadon City.

Place to stand

Go downstairs and exit your house to Pallet Town. This registers Pallet Town as a Fly location, preventing a possible crash at a later point in the guide.
Go back inside your house and take a single step to the right, so you end up at the location indicated by the screenshot above.
Open the party menu and swap the 2nd party pokémon with the 10th pokémon. This sets the amount of pokémon caught in the pokédex to 152, as well as setting the amount of items in the bag to 255.
Open the item bag and scroll down to the 36th item slot. This will be a Master Ball with quantity x0 (see screenshots below). Toss a total of 250 items from it for a final quantity of 6. When tossing, you can press down to underflow the amount of items to be tossed from 0 to 255, then press down 5 more times.
Exit your house. Thanks to changing the item quantity, you will exit to Celadon City.

Slot #36
French	German

Italian	Spanish

Step 3: Setting up a pokémon that can use Fly

In order to assemble the required item code, we need a pokémon that knows Fly and we need the necessary badge to be able to use it. We will be abusing the mechanics of the extended party and the extended inventory to add Fly to the 11th party pokémon.

Potion location

From where you exited out to Celadon, Walk 6 steps right, 4 steps up,6 steps right and another 4 steps up so you end up at the spot indicated by the above screenshot on the left. At this spot, the item in the 35th item slot will have turned into a Potion x0, as indicated by the below screenshots. Using Select, swap this Potion x0 to the 29th item slot. This will give you the Thunderbadge and the Soulbadge, allowing you to use both Surf and Fly. Check your trainer card, you should now have the third and fifth badges.
In the 39th item slot, you'll find a TM23 x64 stack. Toss 45 items from this stack until you get a TM23 x19 stack, then swap it to the 7th item slot. This will alter party pokemon #11's data and allow it to use Fly.
Finally, open the party menu, select the 11th party pokémon and have it use fly. Fly directly to Celadon City. If it doesn't have fly, make sure that the TM23 x19 stack is located in item slot #7.
(Optional) Only if you're playing on the virtual console releases, it is advised to enter the pokémon center and change the current active box any box other than box #2.

It is now safe to save the game.

Slot #35
French	German

Italian	Spanish

Step 4: Assembling an item code in Celadon City

While standing in front of the Celadon City Pokémon Center, take 3 steps right, 5 steps up, 11 steps left and finally 3 steps up to reach the following spot. Make sure to bring a pokémon with Fly/Teleport.

Place to stand

While standing on this spot, open your item bag and keep scrolling down until you find a Thunderstone x0 item stack, located at item slot #35 as indicated by the below screenshot. We will use this spot to orient ourselves for the next section.

Slot #35
French	German

Italian	Spanish

By walking left or right, you can increment or decrement the item ID in slot #35. By walking up and down we can alternate between an item quantity of x0 and x1. We can safely swap the contents of item slot #35 with other item slots, as long as we use Fly/Teleport afterwards to restore the map back to normal. We can use this to collect all the items we need for the item code. slot #33 will always contain a bicycle, you can safely use this to speed up the process.

For every item in the following table, head to the Thunderstone x0 spot, follow the instructions to obtain an item stack, then Fly back to Celadon and head back to the same spot to obtain the next item stack. It is heavily recommended to save after every time you fly back to the Celadon City Pokémon Center.

During the entire process, make sure to not swap two item stacks that have the same item. This will cause both item stacks to merge, resulting in glitches as side effects. When this happens, you can reset the game to restore the game back to normal.

Item ID	Item quantity	How to acquire
TM14	x213	At the Thunderstone spot, swap the Thunderstone with the TM23 x64 stack 4 slots below, then toss 63 TM23s. Walk 1 step up and 9 steps left to get TM14 x0. Toss 43 from the stack, then swap to slot #8. (Make sure to preserve the x19 item stack in slot #7 so you can still use Fly)
Thunderstone	x10	Go to the Thunderstone spot to get Thunderstone x0. Toss 246 from the stack, then swap to slot #9.
TM22	x42	At the Thunderstone spot, swap the Thunderstone with the TM23 x64 stack 4 slots below, then toss 63 TM23s. Walk 1 step up and 1 step left to get TM22 x0. Toss 214 from the stack, then swap to slot #10.
Great Ball	x135	At the Thunderstone spot, walk 30 steps to the left to get Great Ball x0. Toss 99 from the stack, then toss an additional 22 from the stack to reach x135, then swap to slot #11.
Antidote	x48	At the Thunderstone spot, walk 22 steps to the left to get Antidote x0. Toss 208 from the stack, then swap to slot #12.
Poké Ball	x134	At the Thunderstone spot, walk 29 steps to the left to get Poké Ball x0. Toss 99 from the stack, then toss an additional 23 from the stack to reach x134, then swap to slot #13.
Hyper Potion	x44	At the Thunderstone spot, walk 15 steps to the left to get Hyper Potion x0. Toss 212 from the stack, then swap to slot #14.
Super Potion	x32	At the Thunderstone spot, walk 14 steps to the left to get Super Potion x0. Toss 224 from the stack, then swap to slot #15.
TM44	x201	At the Thunderstone spot, swap the Thunderstone with the TM23 x64 stack 4 slots below, then toss 63 TM23s. Walk 2 steps down, 12 steps right, 5 steps down and then 9 steps right to get TM44 x0. Toss 55 from the stack, then swap to slot #16.
X Accuracy	x243	At the Thunderstone spot, walk 13 steps to the right to get X Accuracy x0. Toss 13 from the stack, then swap to slot #17.
Max Potion	x110	At the Thunderstone spot, walk 16 steps to the left to get Max Potion x0. Toss 99 from the stack, then toss another 47 from the stack, then swap to slot #18.

After flying back to Celadon city, we will verify if all items have been successfully collected.

Before opening the bag, walk 5 steps to the right from the entrance of the pokémon center. This will ensure that we can open the item bag without issues.
Open the item bag and swap the Max Potion x110 stack located in slot #18 to the item stack in slot #7. This will remove the ability to fly, but is required to complete the item code.
Next, make sure your item bag looks as follows:

Item slot	Item ID	Item Quantity
Slot #7	Max Potion	x110
Slot #8	TM14	x213
Slot #9	Thunderstone	x10
Slot #10	TM22	x42
Slot #11	Great Ball	x135
Slot #12	Antidote	x48
Slot #13	Poké Ball	x134
Slot #14	Hyper Potion	x44
Slot #15	Super Potion	x32
Slot #16	TM44	x201
Slot #17	X Accuracy	x243

After this item code, head to the room where you can pick up the gift Eevee. Do not pick up this Eevee yet, make sure to save before continuing.

Note: setting up ACE on an existing save

Before heading to the room where you can pick up the Gift Eevee, make sure to do the following:

Full up your party with 6 pokémon, to ensure that newly picked up Pokémon will be sent to the PC.
Change the active box to an empty box.
Only if you have already picked up the gift Eevee in the past, catch any pokémon, nickname it so that it matches the name shown below, then send it to the currently empty box.

Nickname (FR/IT/SP)	Nickname (DE)

Note: unterminated name items in Eevee's room

Within this room, no safe spots exist that allow unterminated name items to be safely handled. Please make sure to not press a or select on unterminated items while in this room.

Step 5: Setting up an initial ACE environment using map script ACE

Now that we have an item code ready, we'll be using it to set up an ACE environment. The item code we just made looks at the nicknames of the pokémon in the currently stored box, then uses pairs of text characters to write a new program. After it finishes, it immediately jumps to execute the newly written program.

Having a party of 255 pokémon makes it impractical to safely enter battle. To circumvent this, we'll be picking up multiple Eevees, nicknaming them, then storing them in the current active box.

We'll be executing ACE by overwriting the contents of item slot #41. This item slot contains the map script pointer. By overwriting it with a pointer aimed for the 7th item slot, the item code we made will be executed on every individual frame the start menu isn't open.

We will be using this in three stages:

First we will alter a value in memory so that we can continuously keep picking up Eevees while we remain on the same map.
Next we will give ourselves a glitch item that, when used, will execute ACE starting from the seventh item slot. This allows us to execute ACE outside of the limits of Map Script ACE.
Finally we will set up a short program that uses the nickname screen to quickly and easily write programs of arbitrary size, effectively giving us a flexible ACE environment.

It is recommended to not save the game until the Nickname Writer program is installed.

A note on using ACE

The first generation of pokémon games, especially the Virtual console releases, are vulnerable to certain crashes wiping the save file. As a protective measure, make sure to open the trainer card to display Red's sprite on screen right before using ACE of any kind. Loading any sprite switches the current active sram bank, offering a measure of safety against game crashes.

Setting up Infinite Eevee mode

First, we'll use Map Script ACE to make sure that we can pick up as many Eevee as we want.

Nickname (FR/IT/SP)	Nickname (DE)

Pick up an Eevee and nickname it so that its name matches the above languagespecific screenshots on the left. It will be sent to the current active box. Previously existing saves that have already picked up Eevee in the past must skip this step.
Open the item bag. Swap the X Accuracy x243 with the contents of item slot #41, which is highlighted on the below screenshots. This will activate Map Script ACE
Close the start menu. If everything went all right, Eevee's poké ball will have reappeared.
Open the item bag. Swap the original contents of item slot #41 with the X Accuracy x243. This will deactivate Map Script ACE.

Slot #41
French	German

Italian	Spanish

Setting up 4F to execute item codes

Next, we'll be entering a list of five nicknames that gives us 4F and the necessary bootstrap. This ensures that using 4F will activate the item code.

List of nicknames (FR/IT/SP)	List of nicknames (DE)

Pick up Eevees and enter the nicknames in the above screenshot one by one. The nicknames from this list needs to be entered in this exact order from the top to the bottom.
Open the item bag. Swap the X Accuracy x243 with the contents of item slot #41, which is highlighted on the below screenshots. This will activate Map Script ACE
Close the start menu. If everything went all right, the CANCEL buttons in the first three slots have been removed and the first item was replaced with a glitch item named "4F"
Open the item bag. Swap the original contents of item slot #41 with the X Accuracy x243. This will deactivate Map Script ACE.
Finally, verify that 4F works by using it. If the game doesn't crash, 4F was set up correctly.

Slot #41
French	German

Italian	Spanish

Setting up the Nickname Writer

Next, we'll be entering a list of fourteen nicknames. This will form a small program that, when activated using 4F, will allow us to easily write large amount of arbitrary code using the nickname screen. For the Italian version, please ensure to pick the correct list of codes for your language.

French	German	Italian	Spanish

Pick up Eevees and enter the nicknames in the above screenshot one by one. The nicknames from this list needs to be entered in this exact order from the top to the bottom.
Exit the room and head to the pokémon center. We'll be testing out the Nickname writer.
Once you're at the pokémon center, use 4F. This should open a screen in which you're asked to enter a pokémon's nickname
For now, press START to end writing the nickname. This should display the main menu, a number should be written on screen.
Press SELECT to exit the Nickname Writer safely.

Using the nickname writer

From this point onward, whenever you use the ACE item, you should be able to open the nickname writer. Please make sure to respect the following:

The Nickname Writer only works when you have the Eevee-filled box set as the current active box. Attempting to use the Nickname Writer with any other boxes set as active will likely crash the game.
Make sure to only use the Nickname Writer inside a pokémon center to ensure that the checksums are correctly displayed.
As a side effect, the Nickname Writer will overwrite the nicknames of the first party pokémon.

The program works as follows:

The program opens the nickname screen and asks you to input a nickname.
This nickname then gets converted to a sequence of five bytes.
All five bytes are written starting from the starting location
The program displays a checksum (sum of all written byte values) to confirm that you correctly entered the code. If the printed checksum doesn't match the expected checksum, you made a mistake entering a code.
Afterwards, it waits for the user to decide what to do.

Write mode	Input mode

Press select to switch between uppercase/lowercase	Checksum is displayed right next to ITEM

During the input phase, the controls are as follows:

Press A for the program to ask for a new nickname and convert that to the next five bytes to be written.
Press B to go back one byte at a time. The checksum will automatically be overwritten by the value written at the current selected address, giving you a measure of how far back you're going. This function is only needed if you accidentally confirmed a nickname without writing all 10 characters.
Press START to immediately start executing the newly written program. Only do this when you've finished writing everything.
Press SELECT to safely quit the Nickname Writer, without executing the newly written code.
Press any button on the D-pad to go back five bytes and ask for a new nickname to correct errors. Use this if the printed checksum does not match the predicted checksum and the last written nickname contained ten characters.

Step 6: Returning the game state to normal

At this point, there are certain side effects that have been introduced by the setup:

For all saves
- By picking up Eevee, we have flagged its poké ball as "obtained"
- The current active box is filled with nicknamed Eevees
- The item pack currently has 255 items
- The item code is currently still required to run the Nickname Writer
For new saves only
- We currently have two badges set as obtained
- Our pokédex currently has 152 pokémon species caught, preventing the story from continuing
- Setting up SRAM glitch has given us a party of 255 pokémon
- We are currently located in the Celadon Pokémon center, while we need to return to Pallet Town to pick up the starter pokémon

We will be removing all these side effect using the Nickname Writer. The nicknames we need to enter will be generated by the Nickname Converter webtool. Simply open the link, copy paste one of the codes below into the converter, then press the "Run" button to display the list of nicknames. Please make sure that you use the Nickname Writer within a poké center, to ensure that the checksums are displayed properly.

When using the Nickname Writer, the generated nicknames need to be entered from top to bottom.

Please ensure to pick the code that suits both your language and your type of save.

Codes to be used with the Nickname Converter webtool

New Saves

Older Saves

French

German

Italian

Spanish

All Languages

21 B2 D5 CB AE
AF EA 5A D3 21
84 DA 22 3D 22
AF 01 26 00 21
FB D2 22 0D 20
FC 2E B5 22 22
23 23 22 22 EA
67 D1 EA 21 D3
01 01 59 CD 42
3E 21 65 DA 36
6E 23 36 D6 C9

21 B2 D5 CB AE
AF EA 5A D3 21
84 DA 22 3D 22
AF 01 26 00 21
FB D2 22 0D 20
FC 2E B5 22 22
23 23 22 22 EA
67 D1 EA 21 D3
01 01 59 CD 44
3E 21 65 DA 36
6E 23 36 D6 C9

21 B2 D5 CB AE
AF EA 5A D3 21
84 DA 22 3D 22
AF 01 26 00 21
FB D2 22 0D 20
FC 2E B5 22 22
23 23 22 22 EA
67 D1 EA 21 D3
01 01 59 CD 3D
3E 21 65 DA 36
6E 23 36 D6 C9

21 B2 D5 CB AE
AF EA 5A D3 21
84 DA 22 3D 22
AF 01 26 00 21
FB D2 22 0D 20
FC 2E B5 22 22
23 23 22 22 EA
67 D1 EA 21 D3
01 01 59 CD 44
3E 21 65 DA 36
6E 23 36 D6 C9

21 B2 D5 CB AE
AF 21 84 DA 22
3D 22 AF EA 21
D3 21 65 DA 36
6E 23 36 D6 C9

Once all nicknames have been entered and verified, you can press START during input mode to execute the code.

This will activate the following effects:

For all saves:
- Reset the state of Eevee's poké ball, allowing it to be picked up again at a later point
- Empty the current active box
- Resets the bag, removing all items aside from 4F and removing the inventory underflow state
- Rewire 4F so that it can activate the Nickname Writer independently of the item code
Only for new saves:
- Reset all badges
- Reset all Pokédex flags
- Removes all party pokémon
- Alters the exit of the poké center to lead out to Pallet Town

From this point onward, you can exit the Poké Center and continue the story as normal.

Additional applications of the Nickname Writer

The Nickname Writer allows you to easily write and execute arbitrary payloads. You can either make and execute your own codes, or head to the Nickname Writer codes page. This page contains a collection of assembly for nickname codes that can be used for a variety of common purposes such as editing pokémon and items, editing player stats, resetting legendaries etc..