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Thank you for your kind explanation Have a good day

True and that's painful. Also we don't have any sort of map to know which dens belong to specific distribution groups for events. I would like to address this some day... You can either propagate seed to all dens or find a den in game -> change its state (collect LP, beat the raid) -> compare changes to previous save file. Once you find a difference you have a "well-known" den which you will probably end up using for all spoofs.

Future daily seeds (those 64-bit ones) are not predictable. Game saves only current and next one, future ones are generated in a cryptographically secure manner. However even if there was a way you would still need a seed from your save and accessing that requires a hacked Switch. There's no way to get around that requirement except joining shiny raids hosted by other people from their hacked consoles. Typically you just use Raid Editor in PKHeX to edit seed values for desired dens. Keep in mind that dens change every day, so pay attention to your clock. Connecting to the Internet also refreshes dens.

That is garbage data as a result of PKHeX reading what it believes "should be" pokemon data in the Poké Pelago storage slots. You'll also find that sometimes after putting a Pokémon into the Poké Pelago, or daycare, or fusing then unfusing Pokémon, that the box report/verify all PKM options will show "clones" of your Pokémon in those slots, because the game sometimes doesn't entirely clear the data from those slots even after the Pokémon has moved out of them.