"Tuxedo Power" is a transformation phrase Mamoru Chiba uses in Pretty Guardian Sailor Moon to transform into Tuxedo Mask.
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It appears only in Act 0 - Minidrama 1: The Secret of Tuxedo Mask’s Birth. Mamoru dramatically holds his mask in front of him in both hands and calls out this phrase. He is then shown putting on his tuxedo from his boxers. As he finishes, he announces himself as "Tuxedo Kamen."
According to his potentially fake story, he first heard this phrase from another Tuxedo Mask as a small child and had been trying to do this since. He turns a bandage into his mask. As that previous Tuxedo Mask is shown in the present, the story was most likely true.