Move data structure (Generation III)
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Format
Every move in Ruby, Sapphire, FireRed, LeafGreen, and Emerald has a 12-byte data structure.
| Move Data | |
|---|---|
| Effect | byte |
| Base power | byte |
| Type | byte |
| Accuracy | byte |
| PP | byte |
| Effect accuracy | byte |
| Affects whom | byte |
| Priority | byte |
| Contact | byte |
| Padding | 3 bytes |
Notes:
- All numbers are to be treated as unsigned unless otherwise specified.
- Numbers prefixed with "0x", "$" or suffixed with "h" are hexadecimal.
- Numbers prefixed with "0" are octal.
- Numbers with no specific prefix or suffix are decimal.
- Accuracy obviously determines move's accuracy. Divide this value by 256 to get the actual accuracy. The fact that it is divided b 256 explains why moves like Swift will sometimes fail while their value for accuracy is set to 0xFF (255). They have a 1/256 chance of failing. This value is set to 0 to reach 100% accuracy.
- Effect accuracy determines probability that the effect associated with a given move will happen. Divide this value by 100 to get the actual effect's accuracy. So that, for instance, a value of 100 gives you 100% chances for the effect to trigger. For yet-unknowned reasons, some moves have this value set to 0 which results in 100% accuracy as well.
- Affects whom determines who the move will hit on a 2 on 2 battle. It can be selected target, user, both foes, random foe, both foes and partner, field, opponent field (Spikes) and last opponent who moved. The following table indicates which value matches a certain target type.
| 0x00 | Selected target |
| 0x01 | Last opponent who moved |
| 0x02 | Unused (?) |
| 0x04 | Random target |
| 0x08 | Both foes |
| 0x10 | User |
| 0x20 | Both foes and partner |
| 0x40 | Opponent field |
| 0x80 | Unused (?) |
Please note that it is theorically possible to combine those values. For example, you could have a move with this value set to 0x18. This would mean it would affect everyone except partner. But, no move seems to use such a combination in the games.
- Priority determines the moves speed, for example EXTREMESPEED is faster than any other move. This byte is signed, i.e. this value can be either positive or negative. If it is stricly less than 0x80 (128) then you got the actual value. If not, the actual value equals: -1 * (256 - Current Value). Thus, value 0xFE (254) must be treated as -2 instead.
- Contact determines whether there is physical contact during the attack or not, for determining effects of certain abilities such as Static and Rough Skin. This byte also determines whether this move is affected by items such as King's Rock or Brightpowder.
- Padding consists of a sequence of 3 bytes. Each one of those bytes should be set to 0x00.
