This is the strongest Shadow Pokemon in the game. You only have one attempt at this, so use the Master Ball. The leader of Cipher has it.
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If missed your chance to get the Shadow Pokemon Tyrannitar and MetaGross, go back to where the Cipher President and his minions are located. You have a chance to fight them all over, and retrieve some of the Shadow Pokemon you did
not catch. Metagross and Tyrannitar are some of the most difficult Shadow Pokemon to get.