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Battle Frontier

The Battle Frontier is a location, accessible in Platinum, HeartGold, and SoulSilver, that houses five Battle Facilities where the goal is to defeat Trainers without losing. Each Battle Facility has a leader, known as the Frontier Brain, who can be battled after a given number of Trainers have been defeated, without the player losing to any one. Each Frontier Brain has two encounters in their facility. Winning the first Frontier Brain fight will give the player a Silver Print for that facility on their Vs. Recorder, and winning the second fight will upgrade the print to a Gold Print. Additionally, achieving 100 wins in the Battle Tower specifically will give the player a star for their Trainer Card, and winning certain modes in the Battle Tower will give the player's Pokémon Ribbons.
The list of facilities is as follows:

• Battle Tower
• Battle Arcade
• Battle Castle
• Battle Hall
• Battle Factory

Although each facility has different rules, there are some restrictions that apply to all of them.

• The player will not receive money, and their Pokémon will not receive experience. Instead, the player will receive BP, which is used as a currency for purchasable items in the Battle Frontier and, in HeartGold and SoulSilver, the Frontier Access.
• Set Mode is enforced.
• The moves Return and Frustration, when used by the opponent or rented Pokémon in the Battle Factory, will always have their maximum power.
• Losing a battle will reset the player's streak to 0. Turning off the game mid-battle, or mid-round without saving, will count as a loss and reset the streak.
• Pokémon encountered in battles will not be added to the Pokédex.
• Defeating a Frontier Brain will give the player 20BP.
• All challenges can be entered as a Single Battle, Double Battle, or Multi Battle. In the Battle Tower, Multis can be entered with either an AI-controlled partner Trainer or another real player (either local or via Wi-Fi). In the other facilities, only the option to join another real player is available. However, the Frontier Brain will only appear in Singles.
• Enemy Pokémon will always take their Nature, Item, moves, and EVs from predetermined 'sets'.
• Enemy Pokémon that can have two Abilities will always have a random Ability. Enemy Pokémon that can be male or female will have their gender randomly determined.
• Any Pokémon holding a Soul Dew cannot enter.
• Heat, Wash, Frost, Fan, and Mow Rotom will revert back to Rotom's default form when entered. All enemy Rotom will also be in their default form. However, a glitch in Platinum only will allow the player to use a Rotom form in Doubles in the Battle Tower if it is entered as the player's fourth Pokémon.
• Some Pokémon cannot be entered altogether, and will never be encountered on an opponent's team:

Specific data about the mechanics of each facility are given on those facilities' pages. Here are some more general resources:

• Pokémon that can appear in the Battle Tower, Castle, Arcade, and Factory
• Pokémon that can appear in the Battle Hall
• Trainers, and associated Pokémon rosters, that can appear in the Battle Tower, Castle, Arcade, and Factory
• Smogon's original Battle Frontier records & discussion topic (lasted from 4 Apr 2009 - 31 Dec 2011)
• Smogon's current Battle Frontier records & discussion topic (started 29 Apr 2020)
• turskain's Frontier Resources spreadsheet, which combines posts and data dumps accumulated over the years from various Smogon posts
• turskain's damage calculator, with the possible opposing movesets built in

Credits & sources

• The original Battle Frontier records topic on Smogon, for the collected resources of many players (notably Team Rocket Elite, Jumpman16 and Peterko), including Pokémon movesets, Trainer information, and mechanics specific to certain facilities (like Factory swapping and Hall IVs).
• The current Battle Frontier records topic, for linking to many additional resources collected in the time since the original records topic.
• Bulbapedia, for various facts such as the items available for purchase in the Frontier, the mechanics of the Battle Castle, and the Battle Points received as rewards. I also took the icons used for the Battle Arcade from their page.
• This documentation on the Battle Arcade by Kurausukun and Magpie, which explains how the roulette panels are generated
• Various users on the Battle Facilities Discord, including SadisticMystic, Magpie, dank, average fella, Mow, and chloe, for providing some updated resources about Trainer rosters and answering various questions I had
• ShinxHijinx, for helping me uncover the IVs of the Frontier Brains' Silver Print battles