[Question] Gen 1/2 to 3+ converting

[danimesq]

Is PKHeX's method updated to be the same as used in the 3DS' Virtual Console?
@kwsch

[sora10pls]

PKHeX simulates official transfer methods as best as it possibly can. As such, no official means of transfer for Generations 1/2 to 3 exist, so these are not legal. You can enable incompatible transfers in your PKHeX settings, but the end results are still illegal.

PKHeX can, though, transfer PK1s/PK2s to PK7s onward, as you're able to transfer from the Virtual Console titles to Pokémon Bank. Example below is the code that converts a PK1 to a PK7.

PKHeX/PKHeX.Core/PKM/PK1.cs

Lines 161 to 241 in 038722e

	public PK7 ConvertToPK7()
	{
	var rnd = Util.Rand;
	var pk7 = new PK7
	{
	EncryptionConstant = rnd.Rand32(),
	Species = Species,
	TID = TID,
	CurrentLevel = CurrentLevel,
	EXP = EXP,
	Met_Level = CurrentLevel,
	Nature = Experience.GetNatureVC(EXP),
	PID = rnd.Rand32(),
	Ball = 4,
	MetDate = DateTime.Now,
	Version = (int)GameVersion.RD, // Default to red
	Move1 = Move1,
	Move2 = Move2,
	Move3 = Move3,
	Move4 = Move4,
	Move1_PPUps = Move1_PPUps,
	Move2_PPUps = Move2_PPUps,
	Move3_PPUps = Move3_PPUps,
	Move4_PPUps = Move4_PPUps,
	Met_Location = Locations.Transfer1, // "Kanto region", hardcoded.
	Gender = Gender,
	OT_Name = StringConverter12Transporter.GetString(RawOT, Japanese),
	IsNicknamed = false,
	CurrentHandler = 1,
	HT_Name = RecentTrainerCache.OT_Name,
	HT_Gender = RecentTrainerCache.OT_Gender,
	};
	RecentTrainerCache.SetConsoleRegionData3DS(pk7);
	RecentTrainerCache.SetFirstCountryRegion(pk7);
	pk7.HealPP();
	var lang = TransferLanguage(RecentTrainerCache.Language);
	pk7.Language = lang;
	pk7.Nickname = SpeciesName.GetSpeciesNameGeneration(pk7.Species, lang, pk7.Format);
	if (RawOT[0] == StringConverter12.G1TradeOTCode) // In-game Trade
	pk7.OT_Name = StringConverter12.G1TradeOTName[lang];
	pk7.OT_Friendship = pk7.HT_Friendship = PersonalTable.SM[Species].BaseFriendship;
	// IVs
	Span<int> finalIVs = stackalloc int[6];
	int flawless = Species == (int)Core.Species.Mew ? 5 : 3;
	for (var i = 0; i < finalIVs.Length; i++)
	finalIVs[i] = rnd.Next(32);
	for (var i = 0; i < flawless; i++)
	finalIVs[i] = 31;
	Util.Shuffle(finalIVs);
	pk7.SetIVs(finalIVs);
	switch (IsShiny ? Shiny.Always : Shiny.Never)
	{
	case Shiny.Always when !pk7.IsShiny: // Force Square
	pk7.PID = (uint)(((pk7.TID ^ 0 ^ (pk7.PID & 0xFFFF) ^ 0) << 16) | (pk7.PID & 0xFFFF));
	break;
	case Shiny.Never when pk7.IsShiny: // Force Not Shiny
	pk7.PID ^= 0x1000_0000;
	break;
	}
	int abil = Legal.TransferSpeciesDefaultAbilityGen1(Species) ? 0 : 2; // Hidden
	pk7.RefreshAbility(abil); // 0/1/2 (not 1/2/4)
	if (Species == (int)Core.Species.Mew) // Mew gets special treatment.
	{
	pk7.FatefulEncounter = true;
	}
	else if (IsNicknamedBank)
	{
	pk7.IsNicknamed = true;
	pk7.Nickname = StringConverter12Transporter.GetString(RawNickname, Japanese);
	}
	pk7.SetTradeMemoryHT6(bank:true); // oh no, memories on gen7 pk
	pk7.RefreshChecksum();
	return pk7;
	}

[danimesq]

Thanks, @sora10pls!

So, Pokemon X/Y were never updated to support the Pokemon Bank (but only the Poke Transporter from BW/BW2) and only SM/USUM?

Also, would it be legal to copy from Gen7 back to Gen3, train these pokemons, then copy their updated stats/evolution back to Gen7?

[sora10pls]

Correct, Virtual Console Pokémon can only be sent to games that are Generation 7 or higher.

No. Backwards transfers are not possible (sans Time Capsule in the GB era games), so a Pokémon that exists in Gen 7 can never legally move back to Gen 1-6 games. They can only move up.

[danimesq]

Right. So I'll have to be patient and some Gen2 Pokemons reserved for Sinnoh (Such as Gligar), I'll have to use the Switch's ShiningPearl instead of the DS' Diamond.

Last (and off-topic/controverse; can't be discussed about legality) question.
I'm developing a recorded PokeJourney standard with some rules that slip from Pokemon's official ones; on this standard, it is permitted to transfer Pokeballs from a generation to another (gen 1 onwards).
So, I've started Pokemon Ruby with pokeballs (from Pokemon Crystal/Johto) and caught Prof. Birtch's foe Poochyena. I'd became attached to Nina but PKHeX says it is invalid because of PID/Location mismatch. What does this error means and, is it possible to fix it (legality about this method is apart)?

[danimesq]

And back at discussing legality - also off-topic:
Is it okay to use the same TID/SID from a game to another?

[Atrius97]

Generally no. The chances of that occurring naturally are astronomically tiny (as in "the sun would burn out before it happens by accident"), and it also causes legality issues when a Pokémon is from a different game/generation, but also is not considered an "outsider Pokémon". That would allow some values that would otherwise be impossible, to exist.