Editing item data B2W2

[0x3DD3CE]

Hello, how do I edit the item data in Black 2? When I open the itemdata narc there's just a bunch of 0s for say the Reveal glass. More specifically, the items that change form for Pokemon don't work like the reveal glass and gracidea.. 

So how do I edit them? 

[Monty3540]

I think this thread might help

 

 

[0x3DD3CE]

Hmm, I see some useful things there but I'm unsure as to which overlay file I will need to dig to edit the data....