N's Castle

N's Castle rising from the ground

After defeating the Elite Four, this castle rises from the ground and attaches itself to the Pokémon League building. According to a Team Plasma Grunt found here, the castle was being secretly built for several years by overworking Pokémon that were taken away from other Trainers.

As the player enters the first floor, six of the Seven Sages attempt to stop them. However, the Gym Leaders of Unova (with the exception of Cilan, Chili, and Cress, as Bianca was unable to reach them in time) intercept the surprise attack, allowing the player to continue.

On the second floor, a member of the Shadow Triad directs the player to a room where two women await them, introducing themselves as Anthea and Concordia. Anthea heals the player's party and Concordia tells the player about N's childhood. A room on the third floor contains a PC that will allow the player to rearrange the party as well. In the same room, scientists mention that now, they could infiltrate the Pokémon Storage System to even release the Pokémon from Trainers' PC Boxes. Team Plasma Grunts are scattered about the other rooms of the building; however, unlike their other encounters, they will not fight, instead celebrating victory or thinking of saying goodbye to their Pokémon. One of these Grunts will allow the player to return to the Pokémon League Pokémon Center, while another Grunt there will transport the player back to the castle, as the player cannot traverse through the Pokémon League again to get there.

N's room resides on the fourth floor. It is decorated in a childish manner, with cloud wallpaper and floor covering as well as there being many toys strewn about the area, many of which can be interacted with. Some of them show sign of recent usage (such as the train set) and some of which denote usage by Pokémon as well as humans, such as the skating ramp which upon inspection is covered in claw marks and scratches. There is a home basketball hoop installed on the west wall, before which lies a basketball with the word "Harmonia" (N and Ghetsis's surname) inscribed on it.

Right before the final battle with N, Reshiram^B/Zekrom^W will emerge from its stone to battle the player. After the Legendary Pokémon is caught, the player has the option to add it to their party. This capture is forced, unless the player's party and PC Boxes are all full, in which case, the Legendary Pokémon will respawn at Dragonspiral Tower during the post-game.

During the battle with N, he uses the Legendary Pokémon opposite to the one caught by the player. After N is defeated, the player must battle Ghetsis, who reveals that he was manipulating N and Team Plasma in order to achieve his own goals. Once Ghetsis has been defeated, the castle is no longer accessible, making the items inside inaccessible as well.

The ruins of N's Castle can be accessed from a large cavern that is located within Victory Road. However, the remnants of the castle can only be accessed after the player has entered the Hall of Fame.

After the player has entered the Hall of Fame, N's Zoroark stops blocking the path that leads to the ruins of N's Castle on Victory Road and leads the player there. After entering the castle, the player and N walk around the ruins that used to be N's Castle, including N's room and the castle's throne room. In the throne room, N asks the player to battle him and his Zekrom^B2/Reshiram^W2. After the player defeats him, N reverts his dragon to its dormant state—the Dark Stone^B2/Light Stone^W2—and gives it to the player to summon Zekrom^B2/Reshiram^W2 at Dragonspiral Tower to catch.

After catching Zekrom^B2/Reshiram^W2, N appears in Nimbasa City near the Rondez-View Ferris Wheel every Friday. After a ride with him and having battled Kyurem in the Giant Chasm, he returns to his castle for a rematch with different Pokémon depending on the season.