Royal Gold Medallion
From the Super Mario Wiki
The Royal Gold Medallion is a key item from Wario: Master of Disguise. It is contained within a purple treasure chest inside Poobah the Pharaoh's Pyramid. During Episode 5, the Pharaoh's royal gatekeeper tells Wario to find it along with the Royal Silver Medallion in order to gain permission to meet the Pharaoh. The medallion is found by traveling to the left of the dark room at the bottom of the pyramid, climbing to the top of a room with numerous moving platforms and Bombats, then going to the right.