Mewtwo was facing away from the party, but began to speak, the voice seeming to reverberate throughout the chamber.
"Welcome. I hope my servant hasn't been too hostile. Deoxys decided long ago that humans weren't worth saving. My opinion differs.
I know you're all wondering why I brought you here. I, and the universe itself, need assistance. This certainly raises many more questions than what you may have already, but let me continue.
As you may know, Dialga and Palkia were lost due to the fool Cyrus's mad ambitions. I am not aware of where the third is, but Giratina holds little power over this world. It is evident that the universe needs those two to function. There is only one solution I know of, based on the various myths of humanity. Deoxys may have enlightened you already, but the fabled eighteen Plates of creation must be gathered. Once this is done, I will attempt to call Arceus, and we will beg Arceus to recreate Dialgia and Palkia. I cannot do this myself; were I to leave this very location, I could not hold together the torn fabric of time and space. I can sense the locations of all of the Plates; that was part of the reason Deoxys was near the Peridot Ward. However, the areas around those places are unstable. I'm afraid the Ward has been lost already, simply vanishing from existence as the pattern fell to pieces. Deoxys cannot retrieve all of them itself; it is incapable of negotiation and many are held by humans. . . or greater forces.
I need you all. I will send you to the places where Plates can be found; you must retrieve them, whatever the cost. I will leave the choice to you which Plate you will retrieve on each journey. The rifts in these areas will allow you to travel there and back quickly, but be aware that the area will be destroyed as you return. Save those that you can.
I will answer any questions you have, but speak quickly, for there is precious little time left."