Glide
From Starfy Wiki
Glide (known in Japan as the Flying Squirrel Jump, ムササビじゃんぷ) is an ability that allows Starfy and Starly to reach much farther places than before. In Densetsu no Starfy, Starfy knows it at the beginning of the game. It is taught by Gaganmo in Densetsu no Starfy 2 and Densetsu no Starfy 3 and is acquired in the third level of Lobber's Cottage in Densetsu no Starfy 4.
To perform this move in The Legendary Starfy, the player can hold B after Starfy or Starly jumps. In the GBA games and Densetsu no Starfy 4, the A button has to be held instead.
Description from The Legendary Starfy
"Glide through the sky with this floaty maneuver."