Pigeon

Dialga rules time, and Palkia rules space, they lived in an alternate dimension so they decided to fight within their own reality, which would make it bad for the real world too. Dialga and Palkia appear before Ash and his friends and drag the city into their own world. If they destroy this city, they'll also destroy the whole world. Source: ANN

* Based on the Boogiepop light novel series written by Kadono Kouhei and illustrated by Ogata Kouji. There is an urban legend that tells of a shinigami that can release people from the pain they are suffering. This "Angel of Death" has a name: Boogiepop. And the legends are true. Boogiepop is real. When a rash of disappearances involving female students breaks out at Shinyo…