"Stop lying, I check your pk8 file, they are illegal, as shiny variant of those pokemon were never released so they are not tradeable, and all your pk8 files failed pkhex legal check."
"You really need to do your research my friend, Volcanion and Marshadow can only have Japanese tag, as that event is Japanese only, they are from the Pokescrap event and they can't be shiny."
"Nah not like I care that much."
Sure
That is the event data so you like it or not that how it is without editing with pkhex, true that Gamefreak suck with their online hack then that why the Shiny Galarian Kanto birds are tradeable, and HA Gen 8 starters was tradeable at launch. You might have a tradeable version but your pk8 file still fail legality check.