Freezer

This tutorial can be achieved on real hardware, or on mGBA emulator using an original (dumped) GBA bios. Other emulators might not be accurate enough.

Tutorials in this section are only for USA/European versions.

The bad eggs created in this tutorial should not be marked or moved in your party: it could corrupt them.

The freezer bad egg is a bad egg that can be used to run any piece of code each frame. It can be used, among other things, to freeze the value of a memory address.

Prerequisite

• A stable ACE glitch species (with its Thumb->ARM bootstrap if needed)
• A certificate exit code bootstrap (you can place it in the first slot of BOX 14 for instance). Note that it does not matter if you have renamed your BOX 14 as the creation of this bad egg uses the hexadecimal-writer bad egg
• The hexadecimal-writer and crafting table bad eggs

Let's go

Ensure the first two slots of your crafting table area are empty, and execute the hexadecimal-writer bad egg with these 2 codes without looking at BOX 12 (or where your crafting table area is) between the execution of the two codes:

=============== CODE 1 ===============

Box  1: 07182DE9
Box  2: 06F04FE2
Box  3: 38109FE5
Box  4: 3C008FE2
Box  5: 000000FF
Box  6: 4B2EA0E3
Box  7: 00000BEF
Box  8: 28B09FE5
Box  9: 04B021E5
Box 10: 18C09FE5
Boxes 11-14: 00000000

=============== CODE 2 ===============

Box  1: 00B09CE5
Box  2: 01005BE1
Box  3: 04B00115
Box  4: 04101105
Box  5: 00108CE5
Box  6: 0718BDE8
Box  7: 10FF2FE1
Box  8: FC7F0003
Box  9: 08F00302
Box 10: 0C001FE5
Boxes 11-14: 00000000

You should now have a bad egg in the first slot of your crafting table (and the second slot should still be empty).

Testing everything worked

We are gonna test our newly created freezer bad egg with a simple script that will basically freeze the PRNG seed to the value 0. Execute the hexadecimal-writer bad egg with this data (your freezer bad egg should still be in the first slot of your crafting table):

Box  1: 0CC09FE5
Box  2: 00B0A0E3
Box  3: 00B0ACE5
Box  4: 10FF2FE1
Box  5: 00000002
Box  6: 805D0003
Box  7: 00000000 
Box  8: 081C0000
Box  9: 9C700000
Boxes 10-14: 00000000

It will generate an Articuno in the second slot of the crafting table. This Articuno contains the code that will be executed each frame by the freezer. Now, move the freezer in your BOX 14 slot 3 (or somewhere else depending on where you put your exit code bootstrap: it should be at least 2 slots after the exit code bootstrap) and the Articuno in the slot just after.

Now, trigger the ACE and observe the world: the NPCs should always do the same moves, there should be no wild Pokemon in the grass, etc. Trigger the ACE again: everything should be back to normal.

For information, the code contained in the Articuno is the following:

ldr r12, [pc, 12]
mov r11, 0
str r11, [r12]!
bx r0
0x02000000
0x03005D80
... (some additional data in order to have a valid Pokemon)

How to use it

Here are some explanations about how to use the freezer bad egg:

• When you want to execute the freezer bad egg, you should put it at least two slots AFTER the exit code bootstrap. When you don't want to execute it (in order to execute the hexadecimal writer or standard ACE), you should put it in the crafting table area or before the last row of BOX 11.
• The code to execute each frame should be placed in the 30-slots area starting at the slot just after the freezer. It is not an issue if this area contains some other data as long as the code to execute is the first.
• The code to execute must end with a BX r0 command. It should also preserve the other registers (of course, if you modify r0, restore its value before calling BX r0). Note that the code will be copied before being executed each frame, so do not expect PC to point inside the PC storage.
• The freezer bad egg works like a toggle that enable/disable the execution on each frame of the provided code. The state of this toggle is not persistent: it will always be disabled after a save and restart.

Registry-Saver Metapod (optional)

The Registry-Saver Metapod is an extension for the freezer.

This extension will take care of saving and restoring all the registers, so that we do not have to worry about preserving the registers anymore when using the freezer.

It can be made with the following code (using the hexadecimal writer):

Box  1: FF 5F 2D E9
Box  2: 08 00 8F E2
Box  3: 04 E0 8F E2
Box  4: 3C F0 8F E2
Box  5: 00 00 00 02
Box  6: FF 5F BD E8
Box  7: 10 FF 2F E1
Box  8: 40 AB 00 00
Box  9: 00 00 00 00
Box 10: 00 00 00 00
Box 11: 00 00 00 00
Box 12: FC 5F 00 00
Boxes 13-14: 00 00 00 00

It will create a Metapod. This Metapod must be placed just after the Freezer bad egg in order to be effective (you will have the freezer bad egg followed by this Metapod followed by the Pokemons or eggs containing the code you want to execute).