Checking for a certain item(s) in inventory

I heard this condition existed. I heard someone made a condition that checked if an item was in the players inventory.
Can someone confirm this?

Well it is at least in FE6, It bloody well has to be to check for the Divine Weapons. I don’t know if it’s in the later games.

I thought you only needed to unlock all the gaidens for the additional ending chapters?

No it’s checking for the weapons, not for the chapters. I believe Venno helped me with a similar ASM project, to check inventories for items and replace them as ASM.