Boulder
From Starfy Wiki
In the Nintendo DS[1] game The Legendary Starfy[2], in Area[3] 2 - Hotcha Springs[4], there are big rocks that you may push around and smash enemies[5] with. The unusually large rocks may be used to block upside-down waterfalls so you may pass. Rocks can also be used to eliminate Nogo[6]s blocking your path.