you can't
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you cant get rid of key items.
The game will not let you delete Key Items, it will say that they are too important to toss.
key items you can't trash but you can trash other items by pressing "trash" on the menu when you select the item
dont listen to this idiot, either =.=" you can use poksav. to delete keys items. and so on.
In Pokémon HeartGold, key items cannot be dropped or sold like regular items. However, some key items can be given to certain NPCs to remove them from your inventory. Alternatively, you can deposit key items in the PC storage system in a Pokémon Center to free up space in your bag. It's important to note that some key items are necessary for game progression and cannot be discarded.