Ok then explain why the Lati@s stones arent tradeable. Clearly it has more to do than detecting "fake"
It's explained in the last paragraph of Kaphotic's post. Even when the Lati Stones come out the ones generated by Powersaves will not be tradable because it's illegal data. They may be tradable if they are from the actual event or found in-game, but not when it's a code generated item.
No, it's because they're not a whitelisted item to trade.
if (item index) is not in (list of items allowed), then reject it.