Got into the files. Taking awhile to get through and figure out. Here's what I got.

File.Itm_held.data

First is all XY Stones

Then a couple of Blank spaces?

Then the new ORAS Megas we already know

Then a lot of odd blanks/filler again

Then it gets interesting

data_Raichite.itm

data_Dragite.itm

data_Crawdite.itm

data_Typhlosite.itm

data_Meganite.itm

data_Feraligite.itm

data_Shuckite.itm

data_Flygite.itm (PLEASE BE WHAT I THINK YOU ARE)

data_Deoxite_A.itm

data_Deoxite_B.itm

data_Regite.itm (Why only one? Need to scan furhter)

data_Croagite.itm

data_Eelekite.itm

data_Hydreigite.itm

data_Hawluchite.itm

data_Goodite.itm

data_Zygardite.itm