Pokémon BW Save File Structure
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Save Entry
The primary save starts at 0x0. The backup save starts at 0x24000.
Main Save File & Backup
| Start | End | Size | Checksum | Mirror | Description |
| 00000 | 003DF | 3E0 | 003E2 | 23F00 | Box Names |
| 00400 | 013EF | FF0 | 013F2 | 23F02 | Box 1 |
| 01400 | 023EF | FF0 | 023F2 | 23F04 | Box 2 |
| 02400 | 033EF | FF0 | 033F2 | 23F06 | Box 3 |
| 03400 | 043EF | FF0 | 043F2 | 23F08 | Box 4 |
| 04400 | 053EF | FF0 | 053F2 | 23F0A | Box 5 |
| 05400 | 063EF | FF0 | 063F2 | 23F0C | Box 6 |
| 06400 | 073EF | FF0 | 073F2 | 23F0E | Box 7 |
| 07400 | 083EF | FF0 | 083F2 | 23F10 | Box 8 |
| 08400 | 093EF | FF0 | 093F2 | 23F12 | Box 9 |
| 09400 | 0A3EF | FF0 | 0A3F2 | 23F14 | Box 10 |
| 0A400 | 0B3EF | FF0 | 0B3F2 | 23F16 | Box 11 |
| 0B400 | 0C3EF | FF0 | 0C3F2 | 23F18 | Box 12 |
| 0C400 | 0D3EF | FF0 | 0D3F2 | 23F1A | Box 13 |
| 0D400 | 0E3EF | FF0 | 0E3F2 | 23F1C | Box 14 |
| 0E400 | 0F3EF | FF0 | 0F3F2 | 23F1E | Box 15 |
| 0F400 | 103EF | FF0 | 103F2 | 23F20 | Box 16 |
| 10400 | 113EF | FF0 | 113F2 | 23F22 | Box 17 |
| 11400 | 123EF | FF0 | 123F2 | 23F24 | Box 18 |
| 12400 | 133EF | FF0 | 133F2 | 23F26 | Box 19 |
| 13400 | 143EF | FF0 | 143F2 | 23F28 | Box 20 |
| 14400 | 153EF | FF0 | 153F2 | 23F2A | Box 21 |
| 15400 | 163EF | FF0 | 163F2 | 23F2C | Box 22 |
| 16400 | 173EF | FF0 | 173F2 | 23F2E | Box 23 |
| 17400 | 183EF | FF0 | 183F2 | 23F30 | Box 24 |
| 18400 | 18DEB | 9EC | 18DEE | 23F32 | Inventory |
| 18E00 | 19333 | 534 | 19336 | 23F34 | Party Pokemon |
| 19400 | 194AF | B0 | 194B2 | 23F36 | Trainer Data |
| 19500 | 1959B | 9C | 1959E | 23F38 | ??? |
| 19600 | 1A937 | 1338 | 1A93A | 23F3A | ??? |
| 1AA00 | 1B1C3 | 7C4 | 1B1C6 | 23F3C | ??? |
| 1B200 | 1BF53 | D54 | 1BF56 | 23F3E | ??? |
| 1C000 | 1C02B | 2C | 1C02E | 23F40 | ??? |
| 1C100 | 1C757 | 658 | 1C75A | 23F42 | ??? |
| 1C800 | 1D293 | A94 | 1D296 | 23F44 | ??? |
| 1D300 | 1D4AB | 1AC | 1D4AE | 23F46 | ??? |
| 1D500 | 1D8EB | 3EC | 1D8EE | 23F48 | ??? |
| 1D900 | 1D95B | 5C | 1D95E | 23F4A | ??? |
| 1DA00 | 1DBDF | 1E0 | 1DBE2 | 23F4C | ??? |
| 1DC00 | 1DCA7 | A8 | 1DCAA | 23F4E | ??? |
| 1DD00 | 1E15F | 460 | 1E162 | 23F50 | ??? |
| 1E200 | 1F5FF | 1400 | 1F602 | 23F52 | ??? |
| 1F700 | 1F9A3 | 2A4 | 1F9A6 | 23F54 | ??? |
| 1FA00 | 1FCDB | 2DC | 1FCDE | 23F56 | ??? |
| 1FD00 | 2004B | 34C | 2004E | 23F58 | ??? |
| 20100 | 204EB | 3EC | 204EE | 23F5A | ??? |
| 20500 | 205F7 | F8 | 205FA | 23F5C | ??? |
| 20600 | 208FB | 2FC | 208FE | 23F5E | ??? |
| 20900 | 20993 | 94 | 20996 | 23F60 | ??? |
| 23F00 | 23F8B | 9C | 23F9A | Checksum Block | |
note: sections might vary in lenght depending on how much data they store (this behavior has been seen at least in trainer data)
Start and End indexes are inclusive.
Gym Badge Obtained Date
Gym badge dates are stored starting 1C704 and 407004. Byte 1 is how many years after 2000, Byte 2 is the month, and Byte 3 is the day (Byte 4 is 0, don't know if it has any meaning or if it's part of the year).