Right when you enter the city when coming from Pastoria town, enter the city and stop. Look to the left and step left once, then look up and step. Click A. If its not there, take another step up and click A. It should be there. That's where I found mine, but I'm not sure if it is different for diamond (in case you're looking for it on that game, too).
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which key there are a ton
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.
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
use the item finder app on your poke wach and look around the hotel use the item finder app on your poke wach and look around the hotel
answer it for you self loosers