Location from pokemon-adventures-frlg by
A tower on Seven Island converted into a Team Rocket fortress -- controlled by Carr's AI system R, holding hostages and housing the arc's climactic confrontation.
Trainer Tower was repurposed by Team Rocket as a fortress, command center, and prison. Carr built the AI system R to control its defenses -- 3D projectors that could create convincing holographic decoys, weapons systems, and traps throughout the structure. Professor Oak and Green's parents were held here. When Blue infiltrated with his Porygon2, the digital Pokemon hacked into R's network and shut it down with Zap Cannon, freeing the hostages. But the real confrontation happened after: Giovanni trapped Mewtwo in the M2 Bind inside the tower, and Red, Blue, and Green used their combined ultimate attacks to free it. Mewtwo, upon breaking free, used its spoon to slice the entire tower in half, destroying it completely. The tower's destruction trapped several of Deoxys's duplicates inside.
A tall, multi-story tower rising from Seven Island's coast. Inside, it has been completely retrofitted with Team Rocket technology -- 3D holographic projectors, defensive weapons systems, and the central computer R. The sterile, mechanical interior contrasts sharply with the natural island outside. After Mewtwo's escape, it was sliced cleanly in half.
Also known as: Trainer Tower, the Tower