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The Battle Frontier is a special post-league area featured in in the Generation IV games, Pokémon Platinum, HeartGold and SoulSilver. It is similar to the Battle Frontier featured in Pokémon Emerald, the Hoenn Battle Frontier. The key difference is the number of facilities and the challenges they hold.
This Frontier is found in two regions, Sinnoh and Johto; each region's Frontier is identical in facilities and appearance. The Sinnoh Frontier is located north of the Fight Area in the place of Pokémon Diamond and Pearl's Battle Park. The Johto Frontier is located west of Olivine City, where the Battle Tower was located in Pokémon Crystal. Access to Johto's frontier is through the Frontier Front. Each of the facilities in the Battle Frontier has a leader, the Frontier Brain, who may be challenged after certain winning streaks have been made through their respective facilities. Defeating the Frontier Brains will earn the player commemorative prints.
Only two of the facilities had been featured in Pokémon games prior to the Battle Frontier's debut in Platinum. The Battle Tower and Battle Factory were both present in Emerald; the Battle Tower has been in every game since its debut in Crystal.