key items you can't trash but you can trash other items by pressing "trash" on the menu when you select the item
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you cant get rid of key items.
You can't store items on Pokemon Diamond and Pearl, as your bag now can carry an unlimited supply of items.
There is a constant sandstorm on route 228 on Pokemon Diamond. It is not possible to ever remove this sandstorm.
somehow
You can't rotate items. They stay in the direction you get them in.