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Because in the manga storyline, Palkia and Dialga battled in the "overworld", and to compensate for the damages, the "Reverse World", Giratina's homeplace, put out a bunch of noxious fumes. Giratina hated them both for it, so it is trying to kill them, I suppose, or at least trap them so they can't do it anymore.

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10y ago

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