The Team Rocket HQ (Japanese: ロケットだんアジトTeam Rocket Hideout), referred to as Team Rocket's Hideout in Generation II, is the headquarters and a hideout for Team Rocket in the Johtoregion, located beneath "Just a Souvenir Shop" in Mahogany Town.
After the player encounters the red Gyarados, Lance requests the player's help to stop Team Rocket's plans. After Ariana is defeated, she explains that they were trying to evolve the Magikarp living in the Lake of Rage because Gyarados are far more profitable and rare than their pre-evolutionary form. Afterwards, Team Rocket abandons the headquarters and searches for their next course of action.
When Lance and the player invade the HQ, the player must defeat the male and female Team Rocket Grunts on the third basement floor to acquire the two passwords to Giovanni's office. In Generation II, after defeating the Rocket Executive in the office, the Murkrow next to his desk tells the player that the password to the generator room is "Hail Giovanni". In Generation IV, Petrel tells the player the password, but also reveals them that the door to the generator only opens when he speaks the password. After defeating him, the Murkrow reveals its ability to mimic voices, and will lead the player to the generator door and open it by speaking the password in Petrel's voice. In Generation II, the player battles a female Rocket Executive at this point, while in Generation IV, the player and Lance battle Ariana and a male Team Rocket Grunt in a Multi Battle. Once the Electrode powering the generator are defeated, Lance gives the player the HM containing Whirlpool as thanks for the assistance.
Though Lance instructs the player to knock out the Electrode powering the generator, the player is able to catch them if they choose to do so, and the result will be the same as if they had knocked them out.
The upper floor of the base contains Persian statues with security cameras in their eyes; walking past one triggers two Team Rocket Grunts that battle the player until they deactivate the cameras using a switch in the center of the area. The far left hallway bypasses most of the Persian cameras, but the floor is booby-trapped with Koffing, Voltorb, and Geodude, which battle the player and have a tendency to Selfdestruct. In Gold and Silver, the player cannot escape from these Pokémon.
The second floor contains the generator room where six Electrode power the radio transmitter. The room is locked and requires a password to open.
The third floor contains workstations, and a passage back onto the second floor leads to the rear of the HQ, where the main office is located. The office is also locked and requires two passwords to open.
While Team Rocket's Hideout does not appear in Pokémon Stadium 2, the player's progress through the Johto Gym Leader Castle is interrupted by a group of four Team Rocket members after they defeat Jasmine. Similar to the core series games, the player is forced to defeat the villainous team before they're allowed to challenge the Mahogany Gym.
The Team Rocket HQ appeared in The Lake of Rage, where Lance and Ethan infiltrated the facility. Lance easily made his way, through the Team Rocket Grunts trying to stop him, to the radio wave generator control room. There, he encountered Petrel, whose Weezing he also easily defeated with his Dragonite. He then destroyed the generator and freed the Electrode Team Rocket had used to power it up.
In the manga
Team Rocket HQ in Pokémon Pocket Monsters
Team Rocket HQ in Pokémon Adventures
In the Pokémon Adventures manga
Team Rocket's Hideout appeared in Raising Raichu. While inspecting a souvenir shop, Lt. Surge heard machine sounds coming from underground, and had his Raichu blast a hole through the floor. Underneath, he found a Team Rocket facility, as well as the new leader of Team Rocket, the Masked Man. Using his Houndour's howl, the Masked Man summoned a pack of wild Houndour to his aid. However, Lt. Surge managed to get away by letting out his Electrode and having all of them use Self-Destruct simultaneously, escaping in the cover of the explosion.