From the Super Mario Wiki
The Monster is a monster truck used by Mario and Luigi in Famicom Grand Prix II: 3D Hot Rally. It was seen as a trophy in Super Smash Bros. Melee and had a cameo in Super Mario Bros. & Friends: When I Grow Up. Monster is slower than the other two car types, but it had more durability than the other vehicles. In Super Smash Bros. Brawl, it appeared as a Sticker that raised launch resistance by four. Nintendo used Monster's design as the basis for the Tiny Titan in Mario Kart Wii.