Ash decides to cooperate with Xiao in order to thwart Luther's ambitions. After Ash is shown remnants of Luther's experiments, Xiao tells him about Luther's goals and explains how Xion is the key.
Because only you can use our
power to cross the time stream.
Weil nur du mithilfe unserer Kräfte
durch die Zeit reisen kannst.
Porque solo tú puedes usar nuestro poder
Toi seul peux remonter le temps
en empruntant nos pouvoirs.