PKHeX/PKHeX.Core/Legality/Structures/ILocation.cs

namespace PKHeX.Core;

public interface ILocation
{
    int Location { get; }
    int EggLocation { get; }
}

public static partial class Extensions
{
    public static int GetLocation(this ILocation encounter)
    {
        return encounter.Location != 0
            ? encounter.Location
            : encounter.EggLocation;
    }

    public static string? GetEncounterLocation(this ILocation Encounter, int gen, int version = -1)
    {
        int loc = Encounter.GetLocation();
        if (loc < 0)
            return null;

        bool egg = loc != Encounter.Location;
        return GameInfo.GetLocationName(egg, loc, gen, gen, (GameVersion)version);
    }
}