Snowka

This is unfortunately what I was starting to think, I almost hoped there was something actually wrong with my Sandshrew because then I wouldn't have to wait on an update to potentially "fix" it

This did not work for me.

The title is the bulk of the needed info. I can't seem to figure out what's wrong with it as the only thing I changed on it (SEVERAL PkHex versions ago) was making it shiny while I still had it in LGPE, and it was counted legal then (yes, I know this probably means it was always illegal, but I know shinies can be obtained from these trades?) At first I assumed it maybe had to do with me being on the previous version of PkHex, so I updated earlier tonight, but I'm still getting the same error.

Shiny Meltan has only been available twice. Once in early 2019, and once in late 2020.

Technically you can save your old gen pokemon from your old gen save as a .pk6 or .pk7 file (I am assuming you're talking about 3DS transfers, but you can still save pk1/2/3/4/5 files from your emulator saves) and load it onto your gen 8 pkhx but it wouldnt have a home tracker. You could then just put ll of them in home to get the trackers though and theyd all be unique