english09

PkHeX is not built to be used with RomHacks, only official versions of the mainline Pokemon games. This is most likely why your save file was corrupted.

Yes, always send from 3DS through Bank to HOME.

If you can do it through legitimate means (such as you laid out: nicknaming in an English Gen 4 game with the same OT), then it should be fine. Just remember: you have to be able to give the OT in the English game the exact same name as the OT in the Japanese game (along with the same ID/SID of course). That requires being able to use the same letters, so you'd need to use letters that are common between the two language games I believe (I think the games treat D i t t o and Ditto as different, so maybe try symbols or something else?).

Well of course there's an issue, you moved those Pokemon (that have already entered HOME once and so have a tracker ID assigned to them) from SWSH to Scarlet/Violet via PkHeX instead of HOME. What that means is HOME can see the Pokemon have somehow moved from SWSH to Scarlet/Violet without going through HOME, which can only mean you used a method such as PkHeX, thus flagging those Pokemon as illegal. If you want to fix it: move those Pokemon back to SWSH (assuming these Pokemon were originally caught in SWSH), delete their HOME Tracker ID's in PkHeX, and then reupload/move them to Scarlet/Violet with HOME (the only official way to move Pokemon from one set of games to another on the Switch).

You realize you don't have to go through all that to know your Mew is legit? You obtained it yourself correct? Just because PkHeX isn't updated yet with that Event's data, doesn't mean your Mew is illegal...

It works until it doesn't - it's extremely easy for them to see the Pokemon was hacked given it entered HOME for the first time (from a game through which it cannot enter HOME for the first time). All they have to do is decide to up their standard even slightly and your Pokemon could end up being marked as hacked. If you just upload it to HOME for the first time via transferring through Bank from Gen 7 (and assuming all it's values/data checks out), then they'll never be able to say it was hacked, as it will look as legal as one that was legitimately obtained and transferred to HOME via the same means. Point being; if you have access to Bank and can transfer to HOME from a Gen 7 game via Bank, then you might as well. Otherwise you're putting your Pokemon at risk for little to no reason.

Any chance we could get a feature to view/edit the Snag List/Shadow Monitor in Colosseum/XD? This feature currently doesn't exist in any of the save editors out there (not even PkmGCSaveEditor), and would be great for being able to view PID's / other info for Shadow Pokemon that are no longer on the save file / were lost (especially for users that want to recreate those lost Shadow Pokemon). Re: PkmGCSaveEditor''s Strategy Memo editor: it can only grant access to the PID's of most Shadow Pokemon, but not all, and it doesn't confirm whether the Pokemon encountered was in fact a Shadow Pokemon or not, so it can be difficult to retrieve PID's for certain Shadow Pokemon that were encountered as normal trainer Pokemon first (given that's the PID the Strategy Memo saves in its data).

So is "Scale" (under the Height and Weight values) the new value for determining a Pokemon's size in Scarlet/Violet? Do Height/Weight factor into anything now (aside from being set) / are they obsolete for Scarlet/Violet?

Wow, interesting - so they're now using Save file identification to ban Switch's using reoccurring save files? Which part of the save files do you think they're using as the "identifying factor"? Beyond just name/TID/SID? Is there an ID number for a save file itself now? Is there anywhere we can read more about this particular "issue"?

Backup my favorite Pokemon from PLA, look at the new Pokemon data and what it includes (are ribbons still preserved despite there being none to obtain in PLA?)

Wait patiently.

Yyyyyyyyes, it has yet to be updated to be compatible with Legends Arceus, that's why it doesn't work.

You don't need wifi on, and it may actually/possibly be getting in the way. Turn wifi off and see if it fixes the issue.

Which game do they originate from?

Encryption constant is used to encrypt/decrypt a Pokémon file in-game, but it is also in effect just another identifying aspect of an individual Pokemon (which is perhaps partially why for BDSP, they decided to use a Pokémon's encryption constant as its identifying variable for Ball Capsule assignment).