P-Down, D-Up

P-Down, D-Up is a badge in Paper Mario and Paper Mario: The Thousand-Year Door, acting as a parallel to P-Up, D-Down. In Paper Mario, it is found in the Crystal Palace, through a boarded-up hole in the floor (which can only be removed using Mario's Spin Jump) and past a colony of Swoopulas. In Paper Mario: The Thousand-Year Door, it is found in the Pirate's Grotto, behind some boxes in the same area where Mario gets his Boat Mario ability, and can be rarely dropped by or stolen from Dark Craws and X-Naut PhDs. If equipped by Mario, it raises his defense by one point, lowering the damage he takes from all enemy attacks, but it also lessens his power by one, lowering the damage of all of his jump and hammer attacks. The badge's effects stack if multiple copies of it are equipped, though Mario's attack power cannot go below one. A variant of the badge exists called P-Down, D-Up P that affects exclusively Mario's partner.

Merluvlee's prediction in Paper Mario

 * "I see...a P-down, D-up Badge. In the Crystal Palace lobby, you can see a similar room on the other side of the glass. You go in the door in that room and break the floor. You then follow the path to the right to find the treasure chest. The Badge, of course, is inside."