I think you use it in th ebuilding with team Rocket to open certain doors if you walk up to them and push B
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The Card Key is located on the Fifth floor in Silph Co. Clear at the bottom by a Rocket Grunt.
The card key in Pokemon Heartgold and Soulsilver is located in the Goldenrod Underground.
The Card Key is found on the floor of the fifth floor of the Silph Co. building in Saffron City.
you can't delet key items in any Pokemon games.
use the lift key to use the lift