Unova Region

The mythology of the Unova Region states that in the past there were two brothers who ruled over the Region, assisted by a powerful Dragon Pokémon. However, the brothers began to fight over how the new nation should be run, and the Pokémon split itself into two: the Deep Black (Black Yin) Pokémon Zekrom, who sided with the younger of the brothers, and the Vast White (White Yang) Pokémon Reshiram, who sided with the older. The two Dragon Pokémon fought endlessly, and it was foretold that they would fight until the Unova Region was destroyed. To stop them, the people of Unova put Reshiram and Zekrom into deep sleeps. Other legends feature the Pokémon Victini, whose presence could turn the tide of battle to its Trainer's favor; Cobalion, Terrakion, and Virizion, who are said to protect Pokémon habitats from humans and have attacked humans' castles for threatening Pokémon; the nature deities Tornadus, Thundurus, and Landorus; and the Boundary Pokémon Kyurem, who is said to have come to the Unova Region on an icy meteor in the past.