Oblivia (Japanese: オブリビア地方Oblivia-chihō) is the region in which Pokémon Ranger: Guardian Signs takes place. This region is an archipelago composed of several islands located far to the south of both Fiore and Almia. It has many ruins and legends. In the past, it had temples used to worship Pokémon, such as Arceus. Across Oblivia are monuments that, when lit, form the Ranger Sign for Latias and Latios. Also, in some places there are monuments that, when specific side quests are completed, reveal special signs for certain Pokémon that can join your team.
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A long time ago, there were many temples in Oblivia. They included the Forest, Fire, Ice, Thunder, Dark, Light and Odd Temples. The oracles in the temples wore a form of armor, and were called Steelheads. The armor let them control Pokémon. Each temple had a captain, who controlled an exceptionally strong Pokémon.