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Each individual Pokémon has a Nature that influences its stats. This Nature is randomly determined upon encountering the Pokémon and cannot be changed. Each Nature raises one stat by 10% and decreases another stat by 10%. No Natures influence HP, and certain Natures don't affect stats at all.
Within NBT tags, Natures are stored as numerical IDs. These numbers are only useful when editing Pokémon NBT data externally.
| Nature | Increased stat | Decreased stat | ID |
|---|---|---|---|
| Adamant | Attack | Special Attack | 7 |
| Bashful | None | None | 3 |
| Bold | Defense | Attack | 9 |
| Brave | Attack | Speed | 6 |
| Calm | Special Defense | Attack | 21 |
| Careful | Special Defense | Special Attack | 24 |
| Docile | None | None | 2 |
| Gentle | Special Defense | Defense | 22 |
| Hardy | None | None | 0 |
| Hasty | Speed | Defense | 14 |
| Impish | Defense | Special Attack | 11 |
| Jolly | Speed | Special Attack | 15 |
| Lax | Defense | Special Defense | 12 |
| Lonely | Attack | Defense | 5 |
| Mild | Special Attack | Defense | 18 |
| Modest | Special Attack | Attack | 17 |
| Naive | Speed | Special Defense | 16 |
| Naughty | Attack | Special Defense | 8 |
| Quiet | Special Attack | Speed | 19 |
| Quirky | None | None | 4 |
| Rash | Special Attack | Special Defense | 20 |
| Relaxed | Defense | Speed | 10 |
| Sassy | Special Defense | Speed | 23 |
| Serious | None | None | 1 |
| Timid | Speed | Attack | 13 |
