While in edit mode, hover over your item, and press " X " to bring up a list of options for that item.
Then scroll down to Creatable, and change it's status from grey to green.
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no
In-game, you must press backspace while selecting an item. Out of game, you must publish a free item and make it free, then have your friend buy it.
YES
no. and if you try to make a Pokemon (holding an item) hold another at the same time, the game will just switch the two items.
There Is no such code. The Griseous orb did not exist when this game was created. That Is why it is taken off of traded Pokemon automatically in Pokemon Platinum. Having such an Item in your game Would make it Crash.