Power Emblem

The Power Emblem is a treasure in. It is actually a playing card of diamonds. The number on it is part of the code to the safe in Hero's Hideaway, so it is randomly generated for each playthrough and is different from the number of the Money Emblem, which is also a card of diamonds.

Collecting the treasure
The Power Emblem is on the third step of the staircase in the southeastern part of the Hero's Hideaway. To collect this treasure, you must ride the rail from along the countertop in the eastern center of the area, and throw 1 Pikmin at it.

Trivia

 * This treasure, as well as the Courage Emblem and Wisdom Emblem, are not only the three treasures needed to open Olimar's bunker in the Hero's Hideaway, but also all happen to represent the three parts of the Triforce in the Legend of Zelda series: Power, Courage, and Wisdom.