kyurem isn't in a castle. it is in the giant chasm. get to the center with a crater, and then there will be a huge blizzard. go straight up to the stairs, and go in the cave, where kyurem is.
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no its black
Yes you can fuse Pokémon however this is only possible in Pokémon Black 2 and Pokémon White 2. Using the DNA Splicers, you can fuse Kyurem and Zekrom to make Black Kyurem and Kyurem and Reshiram to make White Kyurem.
Of course you can 2nd answer: the only nonunova legendaries you can catch are heatran, latias (white 2), and latios (black 2). You need to make black kyurem (black 2) but white kyurem (white 2) can't be traded. However, if you don't have black kyurem, you can make white kyruem, but only if you've caught kyruem.
You get ditto when you go to the Giant Chasm they are found at level 50 and up there that is also where you get Kyurem.
you have to get to the bottom