Hammer Throw is a badge from Paper Mario and Paper Mario: The Thousand-Year Door. In Paper Mario it cost 2 BP to wear and 2 FP to use. Mario can throw his hammer at any enemy with this attack. You can find it on Goomba Road. In the Thousand-Year Door you can find it on the Twilight Trail, or you can buy it at the Pianta Parlor for 50 piantas after getting the Gold Card. It can hit any enemy even if they are hovering and can replace Jumping in Hammer Man setups.
Hammer throw badge

In Paper Mario