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Challenger's Cave (Japanese: 修行の岩屋Training Cavern) is a cave located in the western half of the Unova region. A Black Belt appears to guard the entrance of this cave, allowing the player to pass and explore the cave if he/she has defeated the Elite Four and Team Plasma. It can be accessed at Route 9.
Challenger's Cave appears to be carved out of a slight hill. The cave is very dark, so Flash is required to easily navigate the cave. There is also an underground stream located in Challenger's Cave, so Surf is also required to navigate the lower levels of the cave.
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.
According to Ace Trainer Beverly, there is a story that states that a legendary Pokémon is said to live in this cave. This legendary Pokémon was training its student Pokémon.
However, there is no known legendary Pokémon to be found in Challenger's Cave.