pkBakery - Donut Editor

A Nintendo Switch homebrew application for editing donuts in Pokemon Legends: Z-A save files.

Disclaimer

This software is provided "as-is" without any warranty.
While the app has been tested, it may contain bugs that could corrupt or damage your save files.

Use at your own risk.

The author is not responsible for any data loss or damage to your save data.

This is why the automatic backup system exists — always verify your backups before making changes.

If you need to restore a backup, use a save manager such as Checkpoint or JKSV to import the backup files back onto your Switch.

Compatibility

• Legends Z-A version 2.0.1 only !

Features

Save File Handling

• Reads and writes Pokemon Legends: Z-A save files using SCBlock encryption (SwishCrypto)
• Account-based profile selector — pick which Switch user's save to edit
• Automatic save backup before any modification (backups/<profile>/<timestamp>/)
• Pre-backup storage check — warns if SD card free space is low and lets you continue without backup
• Graceful backup failure handling — prompts to continue or abort if backup fails
• In-place file writing (r+b) to avoid Switch filesystem journal corruption
• Round-trip verification after load (encrypt(decrypt(file)) == file)
• Donut data accessed via SCBlock key 0xBE007476

Donut Editing

Each donut (72 bytes, up to 999 per save) has the following editable fields:

Field	Description
Berry 1-8	8 berry ingredients (66 valid berries)
Flavor 1-3	Flavor effects (284 valid flavors, FNV-1a hashes)

The following fields are auto-calculated from the berry ingredients:

Field	Formula
Stars	From total flavor score of all berries (0-5)
Calories	Sum of berry calories x star multiplier (10 + stars) / 10
Level Boost	Sum of berry boosts x star multiplier (10 + stars) / 10
Berry Name	Set to Berry 1
Sprite ID	Derived from berry donut index and dominant flavor variant

Berry and flavor fields cycle through all valid values with L/R, or jump by 10 with L1/R1.

Empty slots auto-fill with a template donut (Sparkling Power: All Types Lv. 3 + Alpha Power Lv. 3) when entering edit mode.

Donut Legality

All derived stats (Stars, Calories, Level Boost, Berry Name, Sprite) are enforced to match in-game calculations. The star-based multiplier formula stat = sum * (10 + stars) / 10 was verified against in-game data across multiple berry combinations.

Export / Import

• Export a donut to a .donut file in the app's donuts/ folder
  • Filename is customizable via the Switch software keyboard, with a default based on berry name and star rating
  • Unsafe characters are stripped automatically
• Import a .donut file from the donuts/ folder into the selected slot
  • Scrollable file picker with alphabetical sorting
  • Validates berry IDs, flavor hashes, and star rating before importing
  • Applies a fresh timestamp and recalculates stats after import
  • Delete .donut files directly from the import file picker (X button)

Batch Operations

• Set: Shiny Power — Fill the current slot with a 5-star shiny donut (Sparkling Power: All Types Lv. 3 + Alpha Power Lv. 3)
• Set: Shiny Power (Random) — Fill the current slot with a 5-star shiny donut with randomized Sparkling Power, size effects, and Catch Power flavors
• Set: Random Lv3 — Fill the current slot with random berries and 3 distinct random level-3 flavors
• Fill All: Shiny Power — Fill all 999 slots with 5-star shiny donuts with randomized Sparkling Power, size effects, and Catch Power flavors
• Fill All: Random Lv3 — Fill all 999 slots with random berries and 3 distinct random level-3 flavors each
• Clone Selected to All — Copy the current donut to all 999 slots with unique timestamps
• Delete Selected Donut — Clear the current slot
• Delete ALL Donuts — Wipe all 999 slots
• Compress — Remove gaps by packing non-empty donuts to the front
• Export Donut to File — Export the selected donut
• Import Donut from File — Import a donut from file

Flavor Radar Chart

The detail panel displays a radar chart showing the donut's flavor profile (Spicy, Fresh, Sweet, Bitter, Sour) with per-vertex scaling matching game's rendering.

Controls

Profile Selector

Button	Action
D-Pad L/R	Navigate profiles
A	Select profile
-	About
+	Quit

Donut List

Button	Action
D-Pad U/D	Move cursor
L1 / R1	Page up / down
A	Edit selected donut
X	Delete selected donut
Y	Batch operations menu
+	Exit menu
-	About
B	Back to profile selector (with confirmation)

Edit Mode

Button	Action
D-Pad U/D	Select field
D-Pad L/R	Adjust value +/-1
L1 / R1	Adjust value +/-10
A or B	Return to list

Batch Menu / Exit Menu

Button	Action
D-Pad U/D	Select option
A	Confirm
B	Cancel

Import File Picker

Button	Action
D-Pad U/D	Select file
A	Import selected file
X	Delete selected file
B	Cancel

Exit Menu Options

• Save & Quit — Save changes and exit to home
• Save & Back to Profiles — Save changes and return to profile selector
• Quit without Saving — Exit without saving
• Cancel — Return to editor

Donut9a Memory Layout

Offset  Size  Field
0x00    8     Timestamp (ms since 1970)
0x08    1     Stars
0x09    1     Level Boost
0x0A    2     Donut Sprite
0x0C    2     Calories
0x0E    2     Berry Name
0x10    16    Berry[8] (8 x uint16)
0x20    5     DateTime1900 (packed bitfield: year-1900, month, day, hour, minute, second)
0x25    3     (padding)
0x28    8     Flavor 1 (FNV-1a hash)
0x30    8     Flavor 2
0x38    8     Flavor 3
0x40    8     (reserved)

Total: 0x48 (72) bytes per donut, 999 max.

Building

Requires devkitPro with libnx, SDL2, SDL2_ttf, SDL2_image, and dmntcht.

export DEVKITPRO=/opt/devkitpro
make all

make clean

Produces pkBakery.nro. Place in sdmc:/switch/pkBakery/ on your SD card.

Running

Launch via a homebrew launcher in title takeover mode.

Applet mode is not supported due to memory constraints.

Screenshots

Credits

• PKHeX by kwsch — PokeCrypto research, SCBlock/SwishCrypto and donut structure reference
• JKSV by J-D-K — Save backup and write logic reference
• Built with libnx and SDL2