public static bool ValidateRoamingEncounter(PKM pk, Shiny shiny = Shiny.Random, int flawless = 0)
{
var seed = pk.EncryptionConstant;
if (seed == int.MaxValue)
{
return(false); // Unity's Rand is [int.MinValue, int.MaxValue)
}
var xoro = new Xoroshiro128Plus8b(seed);
// Check PID
var fakeTID = xoro.NextUInt(); // fakeTID
var pid = xoro.NextUInt();
pid = GetRevisedPID(fakeTID, pid, pk);
if (pk.PID != pid)
{
return(false);
}
// Check IVs: Create flawless IVs at random indexes, then the random IVs for not flawless.
Span <int> ivs = stackalloc [] { UNSET, UNSET, UNSET, UNSET, UNSET, UNSET };
var determined = 0;
while (determined < flawless)
{
var idx = (int)xoro.NextUInt(6);
if (ivs[idx] != UNSET)
{
continue;
}
ivs[idx] = 31;
determined++;
}
for (var i = 0; i < ivs.Length; i++)
{
if (ivs[i] == UNSET)
{
ivs[i] = (int)xoro.NextUInt(31 + 1);
}
}
if (ivs[0] != pk.IV_HP)
{
return(false);
}
if (ivs[1] != pk.IV_ATK)
{
return(false);
}
if (ivs[2] != pk.IV_DEF)
{
return(false);
}
if (ivs[3] != pk.IV_SPA)
{
return(false);
}
if (ivs[4] != pk.IV_SPD)
{
return(false);
}
if (ivs[5] != pk.IV_SPE)
{
return(false);
}
// Don't check Hidden ability, as roaming encounters are 1/2 only.
if (pk.AbilityNumber != (1 << (int)xoro.NextUInt(2)))
{
return(false);
}
return(GetIsMatchEnd(pk, xoro) || GetIsMatchEndWithCuteCharm(pk, xoro) || GetIsMatchEndWithSynchronize(pk, xoro));
}