Giovanni (Japanese: サカキ Sakaki) was the head of Team Rocket, and served as the secretive Gym Leader of Viridian City's Gym, known officially as the Viridian Gym. He handed out the Earth Badge to Trainers who defeated him. As a Gym Leader, he specialized in Ground-type Pokémon, but his master plan includes collecting rare Pokémon of all types.

During the events of Pokémon HeartGold and SoulSilver, a time-travelling event involving Celebi reveals that the player's rival, Silver, is Giovanni's red-haired son that was mentioned in Pokémon FireRed and LeafGreen. Giovanni is revealed to have all but neglected him, which explains his behaviour towards other people.

In Pokémon Ultra Sun and Ultra Moon, Giovanni makes a return appearance as the leader of Team Rainbow Rocket.

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