PKHeX/PKHeX.Core/Legality/Encounters/EncounterTrade/EncounterTrade4PID.cs

namespace PKHeX.Core
{
    public sealed class EncounterTrade4PID : EncounterTrade
    {
        /// <summary>
        /// Fixed <see cref="PKM.PID"/> value the encounter must have.
        /// </summary>
        public readonly uint PID;

        public EncounterTrade4PID(uint pid) => PID = pid;

        public override Shiny Shiny { get; set; } = Shiny.FixedValue;

        protected override void SetPINGA(PKM pk, EncounterCriteria criteria)
        {
            var pi = pk.PersonalInfo;
            int gender = criteria.GetGender(PKX.GetGenderFromPID(Species, PID), pi);
            int nature = (int)criteria.GetNature(Nature);
            int ability = criteria.GetAbilityFromNumber(Ability, pi);

            pk.PID = PID;
            pk.Nature = nature;
            pk.Gender = gender;
            pk.RefreshAbility(ability);

            SetIVs(pk);
        }

        protected override bool IsMatchNatureGenderShiny(PKM pkm)
        {
            return PID == pkm.EncryptionConstant;
        }
    }

    public sealed class EncounterTrade4 : EncounterTrade
    {
    }
}