The Search for the Rare Bikōchū Beetle

is episode 148 of the original Naruto anime.

Synopsis
Naruto is frustrated by Mizuki's inability to lead him to Sasuke or Orochimaru, and begins pestering Tsunade to allow him to look for him. Hinata sympathizes with Naruto, and suggests trying to find a way to help him. Shino realizes that a Bikochu, a very rare insect, could track down Sasuke if it smelled his scent. As Kurenai Yuhi is being hospitalized for injuries suffered during the prison break, Shino is tasked with leading Team 8 to find the Bikochu, and Naruto joins as the fourth member. It is also revealed that Hinata is practicing a new defensive technique, and has nearly mastered it.