[stpehen]

Originally Posted by Davy_Mcwrecker

No, I did not know that stpehen, where did you learn that?

Bulbapedia.bulbagarden.net has the story of Kyurem, Zekrom and Reshiram.

In mythology, Unova was created by uniting the warring peoples of the land by twin heroes. To do this, they used a single dragon at an unknown point over 2500 years ago. However, the brothers started arguing over something each sought in life; the older brother sought truth and the younger brother sought ideals. Their arguments split the single dragon into Reshiram, who sided with the older brother, and Zekrom, who sided with the younger brother. Since they were both born from the same dragon neither could defeat the other and the brothers declared that there was no right side. However, eventually their sons continued the fight and both the dragons started to battle again, destroying the Unova region with their fire and lightning powers before disappearing.

Sometime after the original dragon had been split into Reshiram and Zekrom, one of the two brothers and their respective dragon created the Relic Castle, which was the seat of a new civilsation for people and Pokémon.

According to Lacunosa Town legend, a long time ago, a large meteor came from the sky containing a terrifying monster. It was said that at night, the monster would appear in the town along with the cold winds and take away humans and Pokémon to eat them. The residents of the town surrounded Lacunosa Town in a wall to keep the monster out, and a rule was then set on the town that forbade anyone from leaving at night and encouraged people to stay in their homes. Even though residents no longer believe this old story, they still stay inside of their houses at night to this day.

Somehow the body of the single dragon flew off into space, mutated into Kyurem and crashed to earth.