While touring Alamos Town-home of the Space-Time Tower- with the beautiful Alice, Ash and his friends discover that the town's special garden has been decimated! Baron Alberto, a dashing but arrogant fellow, immediately blames the destruction on Darkrai. 
As if it just overheard the accusation, Darkrai appears and confronts our heroes! 
Who is Darkrai? Is is a fiend... or a friend in disguise? And as a battle between Legendary Pokemon Dialga and Palkia rages directly abouve Alamos Town-and threatens to tear a hole in the space-time continuum- will Ash and his friends survive this showdown and learn Darkrai's true nature? 
(Source: DVD Cover [English Version])

After defeating Brandon and declining the offer to be a Frontier Brain, Ash sets off to travel through the far away land of Sinnoh. Once he gets there, he meets up with Hikari, a local trainer from the region, and they decide to travel together.

On their way to participate in the next Pokémon contest, Ash, Brock, and Dawn come to Alamos Town, known for its beautiful gardens and the impressive Space-time Tower, built by the famous architect Gowdy. After mysterious swathes of destruction begin to appear and an ominous fog envelops the town, preventing the people from leaving, Tonio, Gowdy's grandson recognizes these phenomena as having been predictions in his grandfather's diary - predictions that the integrity of space and time are under threat from a battle between the legendary Pokémon Dialga and Darkrai. Will Ash and his friends be able to save Alamos Town?
 
(Source: Viz Media)

On the other side of the world, there exists another mysterious, mirror-like dimension known as the Reverse World. In this unique space lives the legendary Pokemon Giratina, a god-like Pokemon who soon finds itself in a great struggle with the legendary Pokemon Dialga! Why are these two Pokemon fighting? And what is the secret of this Reverse World? 
Meanwhile, Satoshi and his friends are traveling when they are greeted by yet another legendary Pokemon, Shaymin. This cute and somewhat cheeky Pokemon holds the secret to the battle between the two god Pokemon, but something unexpected happens to it during its journey. In order to save both worlds, Satoshi joins forces with it to stop the fighting once and for all!

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