In the movie, it lives in a temple in the mountains of Gracidea. It had been asleep for centuries, for so long that moss began to grow on its body. However, when Zero entered the Reverse World and began shattering pillars of ice within it, the glacier in front of Regigigas' temple suffered catastrophic explosions and began moving. This disturbed the great titan's slumber, rousing it into action. When Dawn's Buneary and Swinub failed to stop the glacier with the help of a large group of wild Pokémon, Regigigas appeared in the command of a herd of dozens of Mamoswine and together, they began pushing on the glacier to hold it back. Regigigas returned to its temple at the end of the movie, where it is seen using Hyper Beam on Team Rocket during the credits.