Power Flower (Super Mario 64 DS)
From the Super Mario Wiki
Power Flowers are power-ups that appear in Super Mario 64 DS. They replace the various caps from Super Mario 64. When Mario uses a Power Flower, he is able to float for a short time, similar to the Power Balloon in Super Mario World. If Luigi uses one, he becomes Vanish Luigi, becoming partially immaterial and able to move through certain objects to get to new places, akin to the Vanish Cap. If Wario uses one, he becomes Metal Wario, gaining the ability to walk at normal speed underwater, as well as being able to withstand great winds, akin to the Metal Cap. When Yoshi uses a Power Flower, he gains fire breath that can melt ice and damage enemies, akin to eating Fire Watermelons or fire-based enemies in the Yoshi franchise.