The Battle Castle (Japanese: バトルキャッスルBattle Castle) is a facility located in the southwestern corner of the Battle Frontier in Generation IV. The Battle Castle, as its name suggests, is a huge castle, with elegant furniture on the floor and sparkling jewels on the wall. There is a golden carpet from the entrance to the battle ground. In the stadium itself, Lady Caitlin, the princess of the castle, sits on her throne atop a platform, watching down on battles. Her butler, Darach, directs people to their battle, handing out prizes to people after victory.
In the Battle Castle, players must fight seven opponents in a row. Like in the Battle Arcade, all held items are removed prior to battling. Before entering, Trainers will choose three Pokémon to battle, having their level reduced to 50. After entering, the player will meet Castle Valet Darach in the hallway, and he will give 10 Castle Points, or CP, to the player, and will lead them to the battles.
Castle Points are the currency within the Battle Castle — special things must be done to gain them, but they can be exchanged for certain benefits. Winning allows players to receive Castle Points, which are used in multiple ways. The Castle Points can allow players to heal their Pokémon's HP, PP, both, or buy items for use inside the Battle Castle, such as Berries. Castle Points can also allow players to see their opponents' Pokémon and even increase or decrease their levels by five. Unlike other facilities in the Battle Frontier, in the Battle Castle, Pokémon will not be healed automatically after a battle.
At first, the player will be limited in what they can do with their CP, but if they save up enough, they can rank up and unlock more abilities, such as increasing the selection of items they can buy for their Pokémon, or increasing the amount of information the player can get on the opponent. After winning a battle, the player will have the option to continue, rest, retire, or get their most recent battle recorded on their Vs. Recorder. If the player chooses to continue, they will be able to get the chance to exchange CP for advantages. In Multi Battle mode, both players keep their own individual CP and ranks, but can also spend their CP for their teammate's Pokémon's benefit, such as buying an item that their teammate cannot currently afford or purchase.
Castle Points or CP is used as currency in the Battle Castle. The player automatically receives 10CP on the first entry of a streak. Winning battles allows players to receive Castle Points, which are used in multiple ways. There are certain conditions the player can try to meet for more CP.
Number of Pokémon that have not fainted
Number of Pokémon with full HP
Number of Pokémon with more than half HP remaining
Number of Pokémon with less than half HP remaining
Number of Pokémon with no status ailments
Under 5 PP used in battle
Under 10 PP used in battle
Under 15 PP used in battle
Number of opponent's Pokémon that gained 5 levels
The Castle Points can allow players to heal their Pokémon's HP, PP, both, or buy items for use inside the Battle Castle, such as Berries. Castle Points can also allow players to see their opponents' Pokémon and even increase or decrease their levels by five. This can only be done by exchanging CP earned in battles, before every battle. CP can also be used to rank up certain actions, so instead of renting the normal eight Berries, the player can increase the rank to level 2 so it is possible to rent 8 kinds of Berries and 12 kinds of items. Some advantages can be ranked up twice to level 3 for more advantages. The player will keep all the CP and upgrades accumulated if all the Trainers are beaten successfully; however, if a match is lost or abandoned, their upgrades and CP will be lost as well, and the player must restart with the base 10 CP.
Can rent 32 kinds of Berries and 27 kinds of items
Can see opponent's Pokémon
Can see the opponent's moves
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Lady Caitlin and her valet, Darach are the Frontier Brains for the Battle Castle. Darach is challenged after 21 consecutive battles. The Pokémon that he uses in his first match are unique. They use powerful attacks that burn and paralyze Pokémon. Once defeated, he will give away the silver commemorative print. He is battled again after 49 consecutive battles, and will give away the gold commemorative print when defeated.
The Battle Castle first appeared in Deprogramming Porygon-Z as a part of the Battle Frontier. It was the first Battle Frontier facility challenged by Platinum. At first, she assumed that the items in the facility were rented with money, but upon learning that she had to manage her CP in order to move on in the facility, she was left uncertain of what to do, as she, coming from an extremely wealthy family, had never had to deal with managing limited resources before. However, thanks to a motivational speech by Looker, she eventually got used to managing her CP, like renting a Focus Sash for her Empoleon.