Giovanni is the leader and boss of Team Rocket.

Operation Tempest

Giovanni arrived in East Isshu to kick off the final stage of Operation Tempest. The mission was to use Meloetta to unlock the Reveal Glass in a temple that disappeared in the sea which was never again to be found. The Rocket Gang was able to find that temple, capture Meloetta and unlock the Reveal Glass and attempted to conquer the entire Isshu region. The Reveal Glass was operated by Giovanni who used it to summon Landlos, Tornelos and Voltolos. He was not able to control them for long as Ash Ketchum and his friends intervened and stopped him from controlling the trio. The mirror somehow affected Giovanni but Jessie, James and Meowth got Giovanni away from the main centerpiece on the floor which stopped the control over Giovanni as he was attempting to destroy the Isshu region, not conquer it. After his ambitions were prevented., he then decided to return to the Rocket Gang headquarters in the Kanto region.