>>17835766Trashbytes are sequences of binary in the form of hexadecimal your game produces.
iirc They are produced according to your trainer id and/or name.
These are embedded into your pokemon when they're created. I think, I could be wrong.
Nevertheless, they exist and can be used to prove if a pokemon is legit regardless of proper movesets.
however, it looks like Game Freak doesn't feel like checking every single one for obvious issues.