Team Rocket's main headquarters used to be in the Game Corner at Celadon. They were careful to guard the secret button, but the player eventually discovers the button, which introduces the player to Giovanni whom the player battles occasionally. The two times the player battles him, Giovanni leaves behind the Silph Scope and the Master Ball after he is defeated.
Towards the end of the game, Giovanni is revealed to be the missing Viridian City Gym Leader and he was attempting to rebuild Team Rocket in his gym. Like all of his encounters with the player, he is defeated and gives up the Earth Badge. In the Pokémon FireRed and LeafGreen versions, they also appear in the Sevii Islands. Ember where they search for the Ruby and in Icefall Cave where they are fought off with Lorelei's help.
