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Once the Rainbow is Complete is the 151st episode of the Katekyo Hitman Reborn! anime.
Synopsis
Verde sends out robots to seek Tsuna's missing two guardians, Lambo and Hibari. Hibari defeats his robot and Fon defeats the robot pursuing Lambo. Soon after, the other Arcobaleno arrive to investigate the disturbance. Verde reveals he planned to gather the seven Arcobaleno and uses a machine that emits Anti Tri-ni-sette rays to restrain the Arcobaleno. Using his robots, he captures the Arcobaleno and takes them to his ship.