use the dousing app. around the lobby
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where are special key in Pokemon diamond where are special key in Pokemon diamond
This key is non-existent.
use your invisible item ditecter on your poketech behind the suit area main building(where you are able to heal your pokemon) and then give it to the lady
it is just outside the main lobby for the hotels on the north side of it. it's invisible so you will need to use your item finder.
You can only get the secret key in Pokemon Platinum