Wario to Saikyou Tag da Fii!
Wario to Saikyou Tag da Fii! (Japanese: ワリオと最強タッグだフィー!), roughly meaning With Wario, this is the Best Tag Team, Fii! is one of the chapters from the Densetsu no Starfy manga illustrated by Yumiko Sudō. It is specifically chapter eight of volume two, released in 2003.
The chapter is relevant to the Mario franchise for featuring Wario. Since Wario appears in Densetsu no Starfy 3, this was likely a large factor for his inclusion in the manga, as the manga is based on the first three games in the Legendary Starfy series.
The chapter has Wario searching for treasure in Starfy's world. Wario is seen in a town with a treasure map, but an octopus (most likely Chuta) chases him and soon the police (a group of Taruika) beat Wario up with poles. Wario loses the treasure map, but Starfy and Moe pick it up and decide to go looking for treasure themselves. The map leads them to a cave, but Starfy is separated from Moe after Starfy accidentally activates a trap door and Moe falls through it and then a large boulder blocks Starfy from advancing any further.
Without his treasure map, Wario ends up finding the cave anyway and Wario decides to team up with Starfy, similarly to how Wario teamed up with Starfy in Undersea Ruins in Densetsu no Starfy 3. Wario teaches him how to do an attack like the Wario Attack (for Starfy it is the Shooting Star ability). They make it out of the cave without finding any treasure. It turns out that Moe had already found the treasure. Moe is in a restaurant back in the town (Moe previously thought about eating there without paying) with the treasure chest but Starfy and Wario soon find out where he is and use the Wario Attack and Shooting Star abilities against him.