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you go to a special cave and you catch regirock. Then it will leave behind a special key for registeel in pokemon black 2 and regice in pokemon white 2. then you put the key somewhere, I don't remember exact details, and one of those two, depending on what game you have, will appear right where regirock was. To get the other one, you must use the unova link thing and have a friend give you the other key. Then with those three pokemon, you bring them to the statue of regigigas in clay mountain and he will wake up and you can catch him.

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