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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 to 1.1x its normal level and decreases another stat to 0.9x its normal level. 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 |
