OK so I'm having trouble with trashbytes for OTs for some reason, I'm trying to create a 100% legit looking shiny Mew (from a Japanese Emerald). I've done this before, but even if I try to create results exactly the same as another shiny Mew, the Pal Park trashbytes for the OT are apparently invalid. And I don't understand why or how to fix this, seeing as the trash bytes from the OT should be correct as I've used results like these in my other creations. I put the target game as Black/White, location as Poketransfer, and the encounter as Egg/Pal Park/Event/Honey Tree/Shaymin. Here's the results I keep getting from Pokecheck (I'm new to Pokegening, I want to confirm I can Pokegen correctly):
Original Trainer
► Language Japanese
► Version Hoenn (Emerald)
► ID/SID The pair 26786/30529 looks valid.
► OT ソラ\xFFFF\x0000\x0000\x0000\x0000\xFFFF
All characters in name are valid.
Invalid Pal Park trash bytes.
► GTS Metadata Not available prior to generation 4.
Pokémon
► PID Valid (type 1).
► Shininess Valid
► Nickname ミュウ\xFFFF\x0000\x0000\x0000\x0000\x0000\x0000\xFFFF
All characters in name are valid.
Found all-zero japanese D/P trash bytes. [says this in orange, it would be in green in OT trash bytes were good]
Found valid gen 4 trash bytes from original name "ミュウ".
► Gender Matches personality value.
► Ability Valid, matches PID.
► Pokérus Type 11.0
► Level Valid
► Happiness/Item Valid
Encounter
► Locations Hatch/Met location seems valid.
► Ball Valid Pokéball
Stats & Moves
► IVs Pokémon is likely edited or RNG abused.
► EVs Valid
► Move 1 Valid (TM or tutor)
► Move 2 Valid (level up)
► Move 3 Valid (level up)
► Move 4 Valid (TM or tutor)
How do I fix this? What am I doing wrong?