first you go to the very first screen where it says to push start then you press start and it says mystery gift go to it and there you are
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The code is "Link Together With All" After that you will win a mystery gift. you need to attend a Pokemon convention to open it though, or obtain it via Wi-Fi if you have a DS.
First download the latest emulator of vba (1.8) Then go to options>link and make settings and connect then open another vba and connect it. They will be connected and then you can send mystery gift via another vba
To open up your bag in Pokemon Diamond, simply press X and go to Bag in the Menu. Then, press A.
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.
You cant. You need the key so you can open the room If you cant get into the room you cant change him you might want to try hacking if you didnt get the mystery gift ;)