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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.
| Nature | Increased stat | Decreased stat |
|---|---|---|
| Adamant | Attack | Special Attack |
| Bashful | None | None |
| Bold | Defense | Attack |
| Brave | Attack | Speed |
| Calm | Special Defense | Attack |
| Careful | Special Defense | Special Attack |
| Docile | None | None |
| Gentle | Special Defense | Defense |
| Hardy | None | None |
| Hasty | Speed | Defense |
| Impish | Defense | Special Attack |
| Jolly | Speed | Special Attack |
| Lax | Defense | Special Defense |
| Lonely | Attack | Defense |
| Mild | Special Attack | Defense |
| Modest | Special Attack | Attack |
| Naive | Speed | Special Defense |
| Naughty | Attack | Special Defense |
| Quiet | Special Attack | Speed |
| Quirky | None | None |
| Rash | Special Attack | Special Defense |
| Relaxed | Defense | Speed |
| Sassy | Special Defense | Speed |
| Serious | None | None |
| Timid | Speed | Attack |
