If you are talking about the key that allows you to get into the hotel in Canalave city, You must get it from a mystery event . A mystery event is an event held at game stores, such as Game Stop, where you can download rare Pokemon and items to your Pokemon games, such as Diamond, Pearl, Platinum, Heart Gold and Soul Silver. If you go to a mystery event and are able to get the hotel key, you open the hotel and sleep there for the night. when you wake up, you will be in Canalave city in a different time period and will be able to catch Darkrai.
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ok the key should be just outside of hotel grand lake (the hotel the girls at) in the back where the lady who heals your Pokemon not in the hotel itself but outside in the back you will need the scanner to find the key but its on the pavment :D
where are special key in Pokemon diamond where are special key in Pokemon diamond
This key is non-existent.
Actually, yes you can. South from where she is there's a hidden key, you have to use the item finder to get it.
Go just above the little hotel outside Sunnyshore City, then use the Poketech you use to find hidden items and you should find it not far from the exit.