How to find Kyurem
Go to the Giant Chasm near Lacunosa Town and go to the deepest part of the Chasm. You'll come to Crater Forest. Go to the center where there's a small put with snow in it and approach it to hear Kyurem's battle cry. Then the whole area will be covered in snow. You'll then gain access to a cave to the north west part of the cave. Go to it to battle and catch Kyurem.
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