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 Mode ability, and can be rarely dropped by or stolen from Dark Craws and X-Naut PhDs. If equipped by Mario, it reduces the damage Mario receives by one and lessens his power by one, lowering the damage of all of his jump and hammer attacks. This badge functions differently from Defend Plus in that it does not increase Mario’s Defense. It instead lowers the damage Mario receives by one. This is preferable as there are many attacks in the game that pierce defense. Equipping only one of these badges grants Mario immunity from all attacks from the audience and most stage hazards. 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."