Dragonspiral Tower (Japanese: リュウラセンの塔,Ryūrasen no Tō) is the oldest known tower in the Unova region. Legends said that it was the home of one of the two Dragon Legendary Pokémon which created Unova. In Pokémon Black, Zekrom is encountered just as the player reached the top level of the tower, only to find N having just captured it. In Pokémon White, it is Reshiram that appears here. In Pokémon Black 2 and White 2, the player must go to the Dragonspiral Tower to battle Zekrom/Reshiram.
This is the only place ever in Pokémon video game history where the player is able to normally catch a wild Dragonite. Under-leveled Dragonite can be found outside.
Dragonspiral Tower was the spot where Zekrom/Reshiram were in deep sleep.
After walking in the middle of the first flight of stairs there's a brief earth quake which is Zekrom/Reshiram after they just revived because of N releasing a burst of energy causing the earthquake which knocks over the pillars the second time was the floor just before the top floor there you here Zekrom/Reshirams cries and the power there unleashing during their rampage. In Pokémon Black 2 and White 2, Zekrom/Reshiram will emerge from the stone and the player battles it.