I saw Mewtwo in the video... I guess he travels back in time?
Still waiting on Generation V Stadium game.
Yeah, he travels back in time to assassinate other Sengoku-era warlords, so his friends, the descendants of the Hattori Iga-Ryu ninja, will be in a better position in modern times as a reward for helping him escape his captors.
"Observe what happens when you force a man to change" Just as Planned.