you can't delet key items in any Pokemon games.
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The game will not let you delete Key Items, it will say that they are too important to toss.
94000130 000000000000
dont listen to this idiot, either =.=" you can use poksav. to delete keys items. and so on.
that's' impossible you can never run out of room for key items
you click on bag then go on to key items or items whichever one it is and click use u dimwit HAHAHA