Expanded party
An expanded party is a Pokémon party containing more than six Pokémon.
The player can find many glitch Pokémon and unstable hybrid Pokémon in the expanded party.
The expanded party can be accessed by having over 6 Pokémon directly (D163 in Red/Blue), or by using a glitch to access/swap them without actually having them. This can be done with both the closed menu Select glitch (Japanese versions only) or no expanded party international Select glitching.
In Pokémon Red, Green, Blue, and Yellow
An expanded party can be obtained with the SRAM glitch (including from a save file erased with Up+Select+B, which will give the player 255 party Pokémon), Super Glitch, special menu select glitches (by swapping lift destination and Cerulean City badge man entries), and arbitrary code execution.
Without using the SRAM glitch
Another means of obtaining the expanded party is as such:
- Go to the PC in a Pokémon Center.
- Go to deposit a Pokémon but view its summary first on the deposit/stats/cancel screen. This Pokémon must also have Super Glitch, preferably 0xA6 for the guaranteed corruption, but others have a chance of working.
- After depositing it, check deposit again. If the party is glitched, the Super Glitch corruption worked, otherwise try again (The player can also skip this step to save time, at the risk of it having not worked, or use a memory viewer to check instead).
- If Super Glitch is successful, the player will now have 255 Pokémon (due to a corruption of 0 Pokémon caused by the tiles at the Pokémon Center and Super Glitch, and an underflow from depositing).
- Optionally (but recommended so viewing the expanded party doesn't freeze the game), the player can withdraw a Pokémon from the box, resulting in a party size matching the index number of the chosen Pokémon (for instance, withdrawing Exeggutor makes the expanded party not freeze but changes the party size to 10 (0x0A), and withdrawing Q (0xFF) makes the expanded party not freeze but keeps the size at 255)). Only the first species byte of the stored Pokémon matters.
Applications
From the expanded party, it is possible to perform many tasks; such as:
- Altering items and registered Pokémon in the Pokédex (if a Pokémon is swapped with the 10th).
- Digging up Pokémon that the player doesn't own.
- Performing the Fossil conversion glitch.
- Enabling the player to walk through walls (if the 62nd Pokémon is swapped with the 63rd).
In Pokémon Red, Green, and Pokémon Blue (Japanese), the closed menu Select glitches perform party Pokémon switches ignoring the number of Pokémon in the party; which allows for 'simulated' expanded party switches. A similar exploit (but requiring multiple glitches) in the English versions can be achieved with map size memory corruption.
Sometimes freezes occur when switching certain Pokémon beyond slot 6 or with a closed menu Select glitch due to the zero maximum HP glitch, in which one of the Pokémon has 0 maximum HP but over 0 current HP. This can be worked around by having a 0xFF Pokémon above the desired slot to place the 0 maximum HP Pokémon, so the game doesn't have to handle the HP (with the problem possibly caused by a division by zero when the game attempts to draw the HP bar).
Banning in speedruns
The expanded party has been banned from 151 Pokémon speedruns (catching all 151 species of valid Pokémon aiming for the fastest time possible) for both (Red/Blue and Yellow); the rational that using the glitch to obtain Pokémon wouldn't be seen as obtaining them. Specifically, the expanded party also allows the player to directly change their Pokédex flags having never caught those Pokémon; and the Pokémon beyond slot 6 are extrapolated beyond the data structures for main data, Trainer names, and nicknames (as illustrated below).
Memory addresses
Notes: This assumes no potential technicalities and that the extrapolations are correct. At least the species byte 1 and main data has yielded results, but has only been briefly been checked. This data is for Pokémon Red and Blue; addresses are -1 in Yellow version, and +5 of what they were in the English versions for non-English European versions. For Japanese version data, see Expanded party/RGBYJP.
| Pokémon # | Species byte 1 | Main data (44 bytes each) |
Trainer name (11 bytes each) |
Nickname (11 bytes each) |
|---|---|---|---|---|
| 1 | $D163 | $D16B | $D273 | $D2B5 |
| 2 | $D164 | $D197 | $D27E | $D2C0 |
| 3 | $D165 | $D1C3 | $D289 | $D2CB |
| 4 | $D166 | $D1EF | $D294 | $D2D6 |
| 5 | $D167 | $D21B | $D29F | $D2E1 |
| 6 | $D168 | $D247 | $D2AA | $D2EC |
| 7 | $D169 | $D273 | $D2B5 | $D2F7 |
| 8 | $D16A | $D29F | $D2C0 | $D302 |
| 9 | $D16B | $D2CB | $D2CB | $D30D |
| 10 | $D16C | $D2F7 | $D2D6 | $D318 |
| 11 | $D16D | $D323 | $D2E1 | $D323 |
| 12 | $D16E | $D34F | $D2EC | $D32E |
| 13 | $D16F | $D37B | $D2F7 | $D339 |
| 14 | $D170 | $D3A7 | $D302 | $D344 |
| 15 | $D171 | $D3D3 | $D30D | $D34F |
| 16 | $D172 | $D3FF | $D318 | $D35A |
| 17 | $D173 | $D42B | $D323 | $D365 |
| 18 | $D174 | $D457 | $D32E | $D370 |
| 19 | $D175 | $D483 | $D339 | $D37B |
| 20 | $D176 | $D4AF | $D344 | $D386 |
| 21 | $D177 | $D4DB | $D34F | $D391 |
| 22 | $D178 | $D507 | $D35A | $D39C |
| 23 | $D179 | $D533 | $D365 | $D3A7 |
| 24 | $D17A | $D55F | $D370 | $D3B2 |
| 25 | $D17B | $D58B | $D37B | $D3BD |
| 26 | $D17C | $D5B7 | $D386 | $D3C8 |
| 27 | $D17D | $D5E3 | $D391 | $D3D3 |
| 28 | $D17E | $D60F | $D39C | $D3DE |
| 29 | $D17F | $D63B | $D3A7 | $D3E9 |
| 30 | $D180 | $D667 | $D3B2 | $D3F4 |
| 31 | $D181 | $D693 | $D3BD | $D3FF |
| 32 | $D182 | $D6BF | $D3C8 | $D40A |
| 33 | $D183 | $D6EB | $D3D3 | $D415 |
| 34 | $D184 | $D717 | $D3DE | $D420 |
| 35 | $D185 | $D743 | $D3E9 | $D42B |
| 36 | $D186 | $D76F | $D3F4 | $D436 |
| 37 | $D187 | $D79B | $D3FF | $D441 |
| 38 | $D188 | $D7C7 | $D40A | $D44C |
| 39 | $D189 | $D7F3 | $D415 | $D457 |
| 40 | $D18A | $D81F | $D420 | $D462 |
| 41 | $D18B | $D84B | $D42B | $D46D |
| 42 | $D18C | $D877 | $D436 | $D478 |
| 43 | $D18D | $D8A3 | $D441 | $D483 |
| 44 | $D18E | $D8CF | $D44C | $D48E |
| 45 | $D18F | $D8FB | $D457 | $D499 |
| 46 | $D190 | $D927 | $D462 | $D4A4 |
| 47 | $D191 | $D953 | $D46D | $D4AF |
| 48 | $D192 | $D97F | $D478 | $D4BA |
| 49 | $D193 | $D9AB | $D483 | $D4C5 |
| 50 | $D194 | $D9D7 | $D48E | $D4D0 |
| 51 | $D195 | $DA03 | $D499 | $D4DB |
| 52 | $D196 | $DA2F | $D4A4 | $D4E6 |
| 53 | $D197 | $DA5B | $D4AF | $D4F1 |
| 54 | $D198 | $DA87 | $D4BA | $D4FC |
| 55 | $D199 | $DAB3 | $D4C5 | $D507 |
| 56 | $D19A | $DADF | $D4D0 | $D512 |
| 57 | $D19B | $DB0B | $D4DB | $D51D |
| 58 | $D19C | $DB37 | $D4E6 | $D528 |
| 59 | $D19D | $DB63 | $D4F1 | $D533 |
| 60 | $D19E | $DB8F | $D4FC | $D53E |
| 61 | $D19F | $DBBB | $D507 | $D549 |
| 62 | $D1A0 | $DBE7 | $D512 | $D554 |
| 63 | $D1A1 | $DC13 | $D51D | $D55F |
| 64 | $D1A2 | $DC3F | $D528 | $D56A |
| 65 | $D1A3 | $DC6B | $D533 | $D575 |
| 66 | $D1A4 | $DC97 | $D53E | $D580 |
| 67 | $D1A5 | $DCC3 | $D549 | $D58B |
| 68 | $D1A6 | $DCEF | $D554 | $D596 |
| 69 | $D1A7 | $DD1B | $D55F | $D5A1 |
| 70 | $D1A8 | $DD47 | $D56A | $D5AC |
| 71 | $D1A9 | $DD73 | $D575 | $D5B7 |
| 72 | $D1AA | $DD9F | $D580 | $D5C2 |
| 73 | $D1AB | $DDCB | $D58B | $D5CD |
| 74 | $D1AC | $DDF7 | $D596 | $D5D8 |
| 75 | $D1AD | $DE23 | $D5A1 | $D5E3 |
| 76 | $D1AE | $DE4F | $D5AC | $D5EE |
| 77 | $D1AF | $DE7B | $D5B7 | $D5F9 |
| 78 | $D1B0 | $DEA7 | $D5C2 | $D604 |
| 79 | $D1B1 | $DED3 | $D5CD | $D60F |
| 80 | $D1B2 | $DEFF | $D5D8 | $D61A |
| 81 | $D1B3 | $DF2B | $D5E3 | $D625 |
| 82 | $D1B4 | $DF57 | $D5EE | $D630 |
| 83 | $D1B5 | $DF83 | $D5F9 | $D63B |
| 84 | $D1B6 | $DFAF | $D604 | $D646 |
| 85 | $D1B7 | $DFDB | $D60F | $D651 |
| 86 | $D1B8 | $E007 | $D61A | $D65C |
| 87 | $D1B9 | $E033 | $D625 | $D667 |
| 88 | $D1BA | $E05F | $D630 | $D672 |
| 89 | $D1BB | $E08B | $D63B | $D67D |
| 90 | $D1BC | $E0B7 | $D646 | $D688 |
| 91 | $D1BD | $E0E3 | $D651 | $D693 |
| 92 | $D1BE | $E10F | $D65C | $D69E |
| 93 | $D1BF | $E13B | $D667 | $D6A9 |
| 94 | $D1C0 | $E167 | $D672 | $D6B4 |
| 95 | $D1C1 | $E193 | $D67D | $D6BF |
| 96 | $D1C2 | $E1BF | $D688 | $D6CA |
| 97 | $D1C3 | $E1EB | $D693 | $D6D5 |
| 98 | $D1C4 | $E217 | $D69E | $D6E0 |
| 99 | $D1C5 | $E243 | $D6A9 | $D6EB |
| 100 | $D1C6 | $E26F | $D6B4 | $D6F6 |
| 101 | $D1C7 | $E29B | $D6BF | $D701 |
| 102 | $D1C8 | $E2C7 | $D6CA | $D70C |
| 103 | $D1C9 | $E2F3 | $D6D5 | $D717 |
| 104 | $D1CA | $E31F | $D6E0 | $D722 |
| 105 | $D1CB | $E34B | $D6EB | $D72D |
| 106 | $D1CC | $E377 | $D6F6 | $D738 |
| 107 | $D1CD | $E3A3 | $D701 | $D743 |
| 108 | $D1CE | $E3CF | $D70C | $D74E |
| 109 | $D1CF | $E3FB | $D717 | $D759 |
| 110 | $D1D0 | $E427 | $D722 | $D764 |
| 111 | $D1D1 | $E453 | $D72D | $D76F |
| 112 | $D1D2 | $E47F | $D738 | $D77A |
| 113 | $D1D3 | $E4AB | $D743 | $D785 |
| 114 | $D1D4 | $E4D7 | $D74E | $D790 |
| 115 | $D1D5 | $E503 | $D759 | $D79B |
| 116 | $D1D6 | $E52F | $D764 | $D7A6 |
| 117 | $D1D7 | $E55B | $D76F | $D7B1 |
| 118 | $D1D8 | $E587 | $D77A | $D7BC |
| 119 | $D1D9 | $E5B3 | $D785 | $D7C7 |
| 120 | $D1DA | $E5DF | $D790 | $D7D2 |
| 121 | $D1DB | $E60B | $D79B | $D7DD |
| 122 | $D1DC | $E637 | $D7A6 | $D7E8 |
| 123 | $D1DD | $E663 | $D7B1 | $D7F3 |
| 124 | $D1DE | $E68F | $D7BC | $D7FE |
| 125 | $D1DF | $E6BB | $D7C7 | $D809 |
| 126 | $D1E0 | $E6E7 | $D7D2 | $D814 |
| 127 | $D1E1 | $E713 | $D7DD | $D81F |
| 128 | $D1E2 | $E73F | $D7E8 | $D82A |
| 129 | $D1E3 | $E76B | $D7F3 | $D835 |
| 130 | $D1E4 | $E797 | $D7FE | $D840 |
| 131 | $D1E5 | $E7C3 | $D809 | $D84B |
| 132 | $D1E6 | $E7EF | $D814 | $D856 |
| 133 | $D1E7 | $E81B | $D81F | $D861 |
| 134 | $D1E8 | $E847 | $D82A | $D86C |
| 135 | $D1E9 | $E873 | $D835 | $D877 |
| 136 | $D1EA | $E89F | $D840 | $D882 |
| 137 | $D1EB | $E8CB | $D84B | $D88D |
| 138 | $D1EC | $E8F7 | $D856 | $D898 |
| 139 | $D1ED | $E923 | $D861 | $D8A3 |
| 140 | $D1EE | $E94F | $D86C | $D8AE |
| 141 | $D1EF | $E97B | $D877 | $D8B9 |
| 142 | $D1F0 | $E9A7 | $D882 | $D8C4 |
| 143 | $D1F1 | $E9D3 | $D88D | $D8CF |
| 144 | $D1F2 | $E9FF | $D898 | $D8DA |
| 145 | $D1F3 | $EA2B | $D8A3 | $D8E5 |
| 146 | $D1F4 | $EA57 | $D8AE | $D8F0 |
| 147 | $D1F5 | $EA83 | $D8B9 | $D8FB |
| 148 | $D1F6 | $EAAF | $D8C4 | $D906 |
| 149 | $D1F7 | $EADB | $D8CF | $D911 |
| 150 | $D1F8 | $EB07 | $D8DA | $D91C |
| 151 | $D1F9 | $EB33 | $D8E5 | $D927 |
| 152 | $D1FA | $EB5F | $D8F0 | $D932 |
| 153 | $D1FB | $EB8B | $D8FB | $D93D |
| 154 | $D1FC | $EBB7 | $D906 | $D948 |
| 155 | $D1FD | $EBE3 | $D911 | $D953 |
| 156 | $D1FE | $EC0F | $D91C | $D95E |
| 157 | $D1FF | $EC3B | $D927 | $D969 |
| 158 | $D200 | $EC67 | $D932 | $D974 |
| 159 | $D201 | $EC93 | $D93D | $D97F |
| 160 | $D202 | $ECBF | $D948 | $D98A |
| 161 | $D203 | $ECEB | $D953 | $D995 |
| 162 | $D204 | $ED17 | $D95E | $D9A0 |
| 163 | $D205 | $ED43 | $D969 | $D9AB |
| 164 | $D206 | $ED6F | $D974 | $D9B6 |
| 165 | $D207 | $ED9B | $D97F | $D9C1 |
| 166 | $D208 | $EDC7 | $D98A | $D9CC |
| 167 | $D209 | $EDF3 | $D995 | $D9D7 |
| 168 | $D20A | $EE1F | $D9A0 | $D9E2 |
| 169 | $D20B | $EE4B | $D9AB | $D9ED |
| 170 | $D20C | $EE77 | $D9B6 | $D9F8 |
| 171 | $D20D | $EEA3 | $D9C1 | $DA03 |
| 172 | $D20E | $EECF | $D9CC | $DA0E |
| 173 | $D20F | $EEFB | $D9D7 | $DA19 |
| 174 | $D210 | $EF27 | $D9E2 | $DA24 |
| 175 | $D211 | $EF53 | $D9ED | $DA2F |
| 176 | $D212 | $EF7F | $D9F8 | $DA3A |
| 177 | $D213 | $EFAB | $DA03 | $DA45 |
| 178 | $D214 | $EFD7 | $DA0E | $DA50 |
| 179 | $D215 | $F003 | $DA19 | $DA5B |
| 180 | $D216 | $F02F | $DA24 | $DA66 |
| 181 | $D217 | $F05B | $DA2F | $DA71 |
| 182 | $D218 | $F087 | $DA3A | $DA7C |
| 183 | $D219 | $F0B3 | $DA45 | $DA87 |
| 184 | $D21A | $F0DF | $DA50 | $DA92 |
| 185 | $D21B | $F10B | $DA5B | $DA9D |
| 186 | $D21C | $F137 | $DA66 | $DAA8 |
| 187 | $D21D | $F163 | $DA71 | $DAB3 |
| 188 | $D21E | $F18F | $DA7C | $DABE |
| 189 | $D21F | $F1BB | $DA87 | $DAC9 |
| 190 | $D220 | $F1E7 | $DA92 | $DAD4 |
| 191 | $D221 | $F213 | $DA9D | $DADF |
| 192 | $D222 | $F23F | $DAA8 | $DAEA |
| 193 | $D223 | $F26B | $DAB3 | $DAF5 |
| 194 | $D224 | $F297 | $DABE | $DB00 |
| 195 | $D225 | $F2C3 | $DAC9 | $DB0B |
| 196 | $D226 | $F2EF | $DAD4 | $DB16 |
| 197 | $D227 | $F31B | $DADF | $DB21 |
| 198 | $D228 | $F347 | $DAEA | $DB2C |
| 199 | $D229 | $F373 | $DAF5 | $DB37 |
| 200 | $D22A | $F39F | $DB00 | $DB42 |
| 201 | $D22B | $F3CB | $DB0B | $DB4D |
| 202 | $D22C | $F3F7 | $DB16 | $DB58 |
| 203 | $D22D | $F423 | $DB21 | $DB63 |
| 204 | $D22E | $F44F | $DB2C | $DB6E |
| 205 | $D22F | $F47B | $DB37 | $DB79 |
| 206 | $D230 | $F4A7 | $DB42 | $DB84 |
| 207 | $D231 | $F4D3 | $DB4D | $DB8F |
| 208 | $D232 | $F4FF | $DB58 | $DB9A |
| 209 | $D233 | $F52B | $DB63 | $DBA5 |
| 210 | $D234 | $F557 | $DB6E | $DBB0 |
| 211 | $D235 | $F583 | $DB79 | $DBBB |
| 212 | $D236 | $F5AF | $DB84 | $DBC6 |
| 213 | $D237 | $F5DB | $DB8F | $DBD1 |
| 214 | $D238 | $F607 | $DB9A | $DBDC |
| 215 | $D239 | $F633 | $DBA5 | $DBE7 |
| 216 | $D23A | $F65F | $DBB0 | $DBF2 |
| 217 | $D23B | $F68B | $DBBB | $DBFD |
| 218 | $D23C | $F6B7 | $DBC6 | $DC08 |
| 219 | $D23D | $F6E3 | $DBD1 | $DC13 |
| 220 | $D23E | $F70F | $DBDC | $DC1E |
| 221 | $D23F | $F73B | $DBE7 | $DC29 |
| 222 | $D240 | $F767 | $DBF2 | $DC34 |
| 223 | $D241 | $F793 | $DBFD | $DC3F |
| 224 | $D242 | $F7BF | $DC08 | $DC4A |
| 225 | $D243 | $F7EB | $DC13 | $DC55 |
| 226 | $D244 | $F817 | $DC1E | $DC60 |
| 227 | $D245 | $F843 | $DC29 | $DC6B |
| 228 | $D246 | $F86F | $DC34 | $DC76 |
| 229 | $D247 | $F89B | $DC3F | $DC81 |
| 230 | $D248 | $F8C7 | $DC4A | $DC8C |
| 231 | $D249 | $F8F3 | $DC55 | $DC97 |
| 232 | $D24A | $F91F | $DC60 | $DCA2 |
| 233 | $D24B | $F94B | $DC6B | $DCAD |
| 234 | $D24C | $F977 | $DC76 | $DCB8 |
| 235 | $D24D | $F9A3 | $DC81 | $DCC3 |
| 236 | $D24E | $F9CF | $DC8C | $DCCE |
| 237 | $D24F | $F9FB | $DC97 | $DCD9 |
| 238 | $D250 | $FA27 | $DCA2 | $DCE4 |
| 239 | $D251 | $FA53 | $DCAD | $DCEF |
| 240 | $D252 | $FA7F | $DCB8 | $DCFA |
| 241 | $D253 | $FAAB | $DCC3 | $DD05 |
| 242 | $D254 | $FAD7 | $DCCE | $DD10 |
| 243 | $D255 | $FB03 | $DCD9 | $DD1B |
| 244 | $D256 | $FB2F | $DCE4 | $DD26 |
| 245 | $D257 | $FB5B | $DCEF | $DD31 |
| 246 | $D258 | $FB87 | $DCFA | $DD3C |
| 247 | $D259 | $FBB3 | $DD05 | $DD47 |
| 248 | $D25A | $FBDF | $DD10 | $DD52 |
| 249 | $D25B | $FC0B | $DD1B | $DD5D |
| 250 | $D25C | $FC37 | $DD26 | $DD68 |
| 251 | $D25D | $FC63 | $DD31 | $DD73 |
| 252 | $D25E | $FC8F | $DD3C | $DD7E |
| 253 | $D25F | $FCBB | $DD47 | $DD89 |
| 254 | $D260 | $FCE7 | $DD52 | $DD94 |
| 255 | $D261 | $FD13 | $DD5D | $DD9F |
| 256 | $D262 | $FD3F | $DD68 | $DDAA |
Other buffers:
- Expanded menu sprite animation entries (see Party scrolling memory corruption)
- Expanded battle participation flags (see Participants glitch)
Swapping mechanics
Since each party Pokémon has four distinct pieces of data, for party Pokémon beyond number 6, those data regions often overlap, which causes the effect of swapping two Pokémon to be non-obvious. In addition, the data regions for Pokémon main data extrapolates to the stack region as well as the Echo RAM region, which may also cause complicated behaviors. Discounting possible stack corruption issues, the procedure for swapping two different party Pokémon works as follows[1]:
- Swap their species bytes 1 using the HRAM byte
hSwapTempas the buffer. - Swap their main data using the buffer
wSwitchPartyMonTempBuffer($CC97 for R/B). - Swap their Trainer names using the buffer
wSwitchPartyMonTempBuffer. - Swap their nicknames using the buffer
wSwitchPartyMonTempBuffer.
The details of each individual swap operation should only matter in rare cases, such as when the main data regions of the two Pokémon overlap or when one of them overlaps with the buffer (both thanks to the Echo RAM). Denoting the Pokémon selected first as Pokémon A and the one selected second as Pokémon B, each individual swap operation works as follows:
- Copy the data for Pokémon B to the buffer.
- Copy the data for Pokémon A to the data for Pokémon B.
- Copy the buffer to the data for Pokémon A.
Healing an expanded party
When trying to fully heal an expanded party in Pokémon Red, Green, Blue, and Yellow, the game will attempt to restore HP, status conditions and PP for Pokémon beyond the sixth slot of the party, causing out-of-bounds memory addresses to be corrupted.
Doing any of the following things causes the game to heal the party, and may cause memory corruption if done while having an expanded party:
- Healing at a Pokémon Center
- Blacking out
- Healing by talking to Mom at the player's house in Pallet Town
- Healing at the nurse in Silph Co. 9F
- Stepping onto the purified zone in Pokémon Tower 5F
- Ending a Link Cable battle
- Ending the battle against the rival in Oak's Lab
Conditions for triggering the glitch
There are specific conditions that trigger the memory corruption to happen when healing the party. Notably, it's the lack of a 0xFF terminator byte within the list of party Pokémon species that causes memory corruption, since the party healing function looks for the 0xFF terminator byte to know when it's reached the end of the party.
As such, not all expanded party scenarios will trigger memory corruption from healing the party - most notably, an expanded party obtained via the SRAM glitch will not trigger memory corruption, since the 0xFF terminator byte lies at the beginning of the list. An expanded party obtained via Super Glitch, however, will likely trigger the memory corruption, since Super Glitch tends to overwrite the 0xFF terminator byte at the end of the party Pokémon species list.
Memory corruption pattern
The memory corruption caused by healing with an expanded party is sparse, but can affect a large diversity of memory locations, depending on how soon the 0xFF terminator byte is found.
For each non-0xFF byte found in the party Pokémon species list, the party healing routine traverses the party Pokémon records beginning at 0xD16B (for Pokémon Red and Blue), 0xD16A (for Pokémon Yellow), 0xD12B (for Pokémon Red and Green). Each record is 44 (0x2C) bytes long and the following offsets in each record are manipulated as such:
| Offsets | Description | Action |
|---|---|---|
| 0x01, 0x02 | HP
( |
Overwritten with the values copied from offsets 0x22, 0x23 respectively |
| 0x04 | Status conditions
( |
Overwritten with the value 0 |
| 0x1C, 0x1D, 0x1E, 0x1F | PP for moves
( |
Lower 6 bits are overwritten with max PP value determined from move ID read from offsets 0x08, 0x09, 0x0A, 0x0B respectively, plus bonus PP calculated from PP Up count determined from upper 2 bits of the preexisting value (which are kept the same)
NOTE: If one of the move IDs read is 0, nothing is overwritten for the current offset and the later offsets are skipped, since the game assumes the move list to be terminated. |
To calculate the addresses manipulated when healing a certain party slot, multiply the zero-based index of the slot by the size of the Pokémon record (0x2C bytes), add that to the party starting address depending on the game version as mentioned before, and add the offsets mentioned above to get the effective addresses accessed when that particular party index is healed.
Since the healing routine uses 16-bit pointers to traverse the memory and only looks for a 0xFF terminator byte to stop execution, it can potentially corrupt memory past the end of the expanded party region (that is, beyond the 256th party Pokémon record) and reach I/O registers and HRAM. This has been confirmed with an oversized expanded party obtained via memory hacking and using a debugger.
Effects
Healing with an expanded party may cause the game to crash. This can be caused by corruption of the stack, but it can also be caused by corruption of the map script pointer (which does not usually happen due to an unused memory address containing 0x00 terminating a PP restore as explained above, but can be made to happen if nearby memory was previously corrupted by something like Super Glitch).
Another effect that has been observed after expanded party healing is repeated text prompts, either bringing up a normal text box or a glitched one. It's speculated that this could also be caused by corruption of the map script pointer, since no other affected memory addresses have been found to be a possible cause for this.
Other memory corruption side-effects include possible corruption of game state variables such as party Pokémon OT names and nicknames, owned/seen Pokédex flags, bag items, rival name, map text pointer, map connection data, current sprite set ID, warp entries, signs, trainer data, map connection boundaries and map view VRAM pointer, box items, missable object flags, game progress flags, saved meta-map scripts, event flags, day care Pokémon data and boxed Pokémon data, as well as possible corruption of sound engine variables and the tilemap causing mild graphical and audio glitches.
Pokémon Center glitch animation
An unrelated effect can also be seen when healing at a Pokémon Center with an expanded party, where the animation for placing Poké Balls on the healing station will attempt to place more than 6 Poké Balls, overflowing the OAM buffer and slowly filling the screen with glitch tiles. This animation starts after the party healing has been performed, and is based on the party count, not the presence of the 0xFF terminator byte in the party species list. If the party count is high enough, this can corrupt the map data.
An interesting thing to point out is that the glitch animation will not happen with a party that's merely missing its 0xFF terminator byte but has a normal party count, but the corruption from the party healing itself will still happen in this case.
In Pokémon Gold, Silver and Crystal
An expanded party can be obtained with the ????? party overloading or arbitrary code execution. It is more prone to freezes than in Generation I.
The expanded party with specific requirements can enable the party-based map distortion glitch found by werster and RingRush.
Additionally, it is possible to cause limited memory corruption by swapping the moves of party Pokémon beyond slot 6 using the "move" option.
In Pokémon Emerald
| This article is incomplete. Please feel free to add any missing information about the subject. |
The expanded party can be accessed indirectly with Glitzer Popping, directly through the News Reporter trick (itself currently requiring Glitzer Popping), and possibly both directly and indirectly through arbitrary code execution.
Other names
- Pokédos Cartouche (or Poké-dos Cartouche).
See also
- Expanded inventory
- Expanded PC items
- Expanded Pokémon Storage System
- Moves beyond slot 4
- Expanded Poké Mart (accessed with Yami Shop glitch)
- Custom badge describer list
- Custom lift list
Trivia
- Despite the huge size of the expanded party, it can seemingly not touch HRAM.
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