In Paper Mario
Defend Plus is a badge that boosts Mario's Defense by 1.
In Paper Mario, Defend Plus is found in Shy Guy's Toy Box. It uses 6 BP.
In Paper Mario: The Thousand-Year Door, it is found in Twilight Town and Rogueport Sewers. It can also be stolen from Chain Chomps, Bulky Bob-ombs, and Bob-ulks. It uses 5 BP.