The Ruined Hall
It is a straightforward stage containing only a boss battle against Galleom for the second and final time before entering the Great Maze. The player plays as either Lucas or the Pokémon Trainer. After the battle, Galleom's head reveals a Subspace Bomb, which is set to detonate over the ruins in 15 seconds. The Pokémon Trainer faints, but Lucas uses PK Thunder on Galleom's arm, breaking it off and sending Lucas and the Pokémon Trainer falling towards the ground. After this, Lucas sees no other option and braces for impact, grabbing onto the Pokémon Trainer. Fortunately, Lucas and the Pokémon Trainer are saved by the near-by Meta Knight, who had earlier fought Galleom with Ike and Marth. Wario's trophy, defeated earlier, is sucked into Subspace, along with the ruins. After completion, the stage along with The Ruins cannot be replayed for the rest of the Subspace Emissary until the mode is cleared.
After The Ruined Hall is completed, Galleom tried to explode Lucas and Pokémon Trainer with a subspace bomb, but Lucas broke his arm with a PK Thunder, he and unconscious Pokémon Trainer were falling down, and before collapsing with the floor, Meta Knight saved them, gathering them with Marth and Ike, going away for the explosion that sucked Wario's trophy.