Shakejii's Notebook
From Starfy Wiki
Shakejii's Notebook (Japanese: シャケじいのてちょう), also known simply as the Notebook (Japanese: てちょう) is an item in Densetsu no Starfy 4 which is found in Stage 4-2 (Pulling Ahead Lake). Shakejii asks Starfy to find it and teaches him the Mighty Star Spin so he can use it against some ocean currents that block the way.
As a reward for finding the Notebook, Shakejii rewards Starfy, Starly and Moe with the Tremendous Mustache Accessory.