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For Kyurem: This is the first Pokémon in a movie that has the protagonists on the run the moment it appears, took out the Musketeer Trio in one hit with a well placed ice attack, shrugs off practically every damn thing done to halt him, and despite Keldeo's best efforts the guy still won the rematch.
Kyurem freezing the remains of his den as the building starts to collapse all around our heroes. Kyurem proceeds to create an ice castle in the process.