PKHeX/PKHeX.Core/Game/Nature.cs

namespace PKHeX.Core
{
    /// <summary>
    /// Nature ID values for the corresponding English nature name.
    /// </summary>
    public enum Nature : byte
    {
        Hardy,
        Lonely,
        Brave,
        Adamant,
        Naughty,
        Bold,
        Docile,
        Relaxed,
        Impish,
        Lax,
        Timid,
        Hasty,
        Serious,
        Jolly,
        Naive,
        Modest,
        Mild,
        Quiet,
        Bashful,
        Rash,
        Calm,
        Gentle,
        Sassy,
        Careful,
        Quirky,

        Random = 25,
    }
}