How do I make an item that shows a text box?
In the item editor, you will see an option called When Used Outside of Battle: Normally this is used to assign an attack to an item, for things like cure potions. However, you can also assign a text box here. When you use this item from your inventory, it will immediately pop up that text box. If you want to attach a plotscript of a battle or something like that to an item, attach it to a text box, and then attach the text box to the item