So, since I noticed there was no documentation for Italian trash bytes (apart from D/P Pal Park ones) I went ahead and used my old DS with Sapphire and a slot-1 cart to Pal Park stuff (nicknamed "A" beforehand, of course) into the 4 Gen games. I also hatched Aron eggs in all the 4 Gen Italian games to get the Egg trash bytes.
Full chart below:
HGSS PAL PARK: 00 00 00 00 42 00 00 00 00 00 00 00 8C 15 0D 02 E0 FF (not recognized by PokeCheck)
DP PAL PARK: 54 20 0D 02 42 00 00 00 00 00 00 00 84 A1 0C 02 E0 FF
PL PAL PARK: 00 00 00 00 42 00 00 00 00 00 00 00 84 15 0D 02 E0 FF
DP EGG: 00 00 08 40 19 C0 04 51 0D 02 28 3B
PL EGG : 38 02 08 40 19 C0 BC B3 0C 02 30 37
HGSS EGG: 00 00 00 19 11 02 02 00 00 00 08 40
