BioGiovanni is the leader and boss of Team Rocket.
Operation TempestGiovanni 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 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.
A Golem owned by Giovanni. Golem was used in a Viridian Gym battle against Gary Oak's Nidoking. It was defeated by a single Tackle attack
Giovanni's Rhydon was lent to Jessie, James and Meowth before Giovanni took a leave of absence in order to protect the Viridian City Gym if anyone wished to challenge the Gym Leader. During Jessie's Gym Battle battle with Ash, Ash's Pidgeotto's used Quick Attack followed by Double Edge on it. Shortly after, it was defeated when Pikachu used Thunderbolt on Jessie's whole team.
Giovanni's Cloyster is kept in storage at the Viridian City Gym
Machamp is a Pokémon that belongs to Giovanni but was given to Jessie whilst she along with James and Meowth looked after Viridian City Gym in his absence. Jessie order Machamp to attack Ash's Squirtle and Ash realised that the podium he was standing on was rigged to shock him when his Pokémon was attacked. After getting up to his feet after the shock Ash switched Pokémon to Bulbasaur and Jessie switched to Kingler
A Kingler owned by Giovanni. Kingler was used against Gary Oak's Nidorking during a Pokémon Gym Battle at Viridian City.Kingler advanced quickly on Nidoking using a crabhammer, forcing Gary Oak to switch Nidoking out for Arcanine. [View More]
After Escaping from the clone laboratory on Cinnebar Island, Mewtwo met Giovanni where they entered into an agreement where Giovanni would focus Mewtwo's powers and Mewtwo would help Giovanni's goals. Giovanni provided Mewtwo with a suit which would help Mewtwo focus his powers and it was given the chance to show his power when battling for Giovanni at his Pokémon Gym in Viridian City. Mewtwo destroyed Team Rocket's HQ and shed the robotic suit after it discovered that Giovanni was using him for his powers
Persian is Giovanni's pet and it rarely does anything else except sit beside Giovanni and wait for it to be pet by him. Meowth has always been jealous of Persian because he used to be a favorite of Giovanni but Persian took his place. Persian and Meowth are rivals and Meowth hopes to one day return to good graces with Giovanni to become his trusted pet and kick Persian out.