Mechanic · combat · role-playing game

Nature

A fixed trait, rolled when a creature is created, that raises one stat and lowers another for its whole life.

stubAlso: natures, Pokémon nature, personality natureUpdated 2026-10-21
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In Ruby and Sapphire, a Pokémon’s nature is its personality value mod 25, and each nature raises one stat by 10% and lowers another by 10%, except five that change nothing1.

See also

Games

GameYearHowNote
Pokémon Ruby and Sapphire200225 natures from the personality value, ±10% on two stats
Every claim about this mechanic, by game (1)
Pokémon Ruby and Sapphire 2002A Ruby and Sapphire Pokémon's nature is its personality value mod 25; each of the 25 raises one stat other than HP by 10% and lowers another by 10%, rounded down, except Hardy, Docile, Serious, Bashful, and Quirky, which change nothing.Code

References

  1. ^ abA Ruby and Sapphire Pokémon's nature is its personality value mod 25; each of the 25 raises one stat other than HP by 10% and lowers another by 10%, rounded down, except Hardy, Docile, Serious, Bashful, and Quirky, which change nothing.Codepret/pokeruby
    How we know
    261u8 GetNatureFromPersonality(u32 personality)
⋮
263    return personality % 25;
    src/pokemon_3.c lines 261–264 at 5784633 · upstream ↗
    627u16 nature_stat_mod(u8 nature, u16 n, u8 statIndex)
⋮
638    switch (gNatureStatTable[nature][statIndex - 1])
⋮
640    case 1:
641        return (u16)(n * 110) / 100;
642    case -1:
643        return (u16)(n * 90) / 100;
    src/pokemon_3.c lines 627–657 at 5784633 · upstream ↗
    1285const s8 gNatureStatTable[][5] =
⋮
1287    // Atk Def Spd Sp.Atk Sp.Def
1288    {    0,  0,  0,     0,     0}, // Hardy
1289    {   +1, -1,  0,     0,     0}, // Lonely
    src/pokemon_1.c lines 1285–1313 at 5784633 · upstream ↗

    Checked against the evidence by its author, an AI model, 2026-10-21.

    Checked by a second AI model, 2026-10-21.

    In the claim ledger

Sources

Code