Recent commits have added PersonalType1, PersonalType2 to accomplish what you are asking. Held Item you can specify the full localized name ("Meadow Plate" in this case -- not "MeadowPlate").
Suggesting held items is way too subjective.
yeah sounds like the ROM hack plays around with the data and checksums in the HoF area.
When you export from PKHeX, it fixes all checksums. So that area gets 'fixed', which isn't what your ROM hack expects, thus it appears as corruption.
You could go with cheat codes for your device/emulator, if those work for this ROM hack.
Obligatory reminder/warning about injecting images being bannable, as player photos are shared for PvP battles / etc.
It is recommended to never inject images that end up being transmitted from your console, because it's a clear indicator of a hacked console.