Pocket Monsters Diamond & Pearl: Arceus Choukoku no Jikuu e

Long ago, the mighty Pokémon Arceus was betrayed by a human it trusted. Now Arceus is back for revenge! Dialga, Palkia and Giratina must join forces to help Ash, Dawn and their new friends Kevin and Sheena stop Arceus from destroying humankind. But it may already be too late!
(Source: Viz Media)
The Viz Media version has the original 3 chapters arranged as 2 bigger chapters.