| Underground Ruins 地底遺跡 Chitei Iseki | |
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| Information about Underground Ruins | |
| Region: | Unova |
| Connecting locations: | Clay Tunnel |
| Weather: | Normal |
| Kind: | Cave |
| Needed HM: | None |
| Generation(s) available: | V |
Underground Ruins is an area located within Clay Tunnel, where Regirock, Regice, and Registeel can be caught. Their method of capture depends on the game version; Regirock is found in the Rock Peak Room after a puzzle is solved, while Regice is found with the Iceberg Key in Pokémon White 2 and Registeel with the Iron Key in Pokémon Black 2. The key unavailable in one game version can be transferred via the Unova Link.
If all three Pokémon here are caught, Regigigas can be captured in Twist Mountain.
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