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 apparently 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, ReshiramB/ZekromW 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.
In Pokémon Black 2 and White 2
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 ZekromB2/ReshiramW2. After the player defeats him, N reverts his dragon to its dormant state—the Dark StoneB2/Light StoneW2—and gives it to the player to summon ZekromB2/ReshiramW2 at Dragonspiral Tower to catch.
After catching ZekromB2/ReshiramW2, 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.
N's Castle was first seen in a flashback in The Name's N!. When Ash told N how he and his friends were trying to find Reshiram, N had a flashback of his youth, a moment when he had been at his castle, which, along with its surroundings, had been on fire. He saw Reshiram appearing before him, and kept looking at it as it flew away.
The Castle was also seen in a flashback in Secrets From Out of the Fog!, where a ceremony involving N and led by Ghetsis and the other Seven Sages was taking place, when suddenly Reshiram appeared, setting the castle ablaze with its Fire attacks, preventing the ceremony from being completed, much to Ghetsis's anger.
In the anime, the castle is described as a mansion and is less grand in appearance than it is in the games.
In Cold Hard Truth, Zinzolin summoned the castle from underground via remote control, surrounding the Pokémon League building. Team Plasma Grunts emerged from the castle and surrounded the League viewers, while the Seven Sages and N watched from above as the chaos took place. N and Black had their final battle on top of the castle, which eventually moved to inside. White found her way in N's room after being teleported there by Hood Man, where she met Anthea and Concordia.
While Black and N were battling, Team Plasma displayed the Gym Leaders they had captured on crucifixes as a sign of their power. However, all the Trainers whom Black had met during his journey showed up to help, swearing to do everything in their power to protect Unova. Thanks to their cooperation, all the captured Gym Leaders were freed, and they joined the battle against the Seven Sages. The Elite Four, meanwhile, focused their attention on Hood Man and the Forces of Nature.
N's Castle in Pocket Monsters BW: The Heroes of Fire and Thunder
After Black successfully beat N, Ghetsis attacked him in order to silence him and keep the word of N's defeat from getting out. As Ghetsis had assembled a team of Pokémon specifically designed to counter Black's team, Black was initially at a disadvantage. However, after he figured out and that Ghetsis was using a Volcarona to power up his Pokémon, and had his Pokémon swap their opponents to ones more suitable for them, he was finally able to defeat Ghetsis. Afterwards, N flew away with Zekrom, and as Reshiram's counterpart was no longer present, the Vast White Pokémon started reverting back into its form as the Light Stone. Seizing the chance, Ghetsis pushed Black into Reshiram, causing him to be sucked into the Light Stone as well. Before White could grab the stone, it flew away into parts unknown.
Related cards Cards listed with a blue background are only legal to use in the current Expanded format. Cards listed with a silver background are legal to use in both the current Standard and Expanded formats.