Greninja

Ash Ketchum, now known as The Mastermind has reached Unova after unleashing utter destruction in Sinnoh and that is when things get harder for Team Empire. Many Team Empire members are randomly dying by some super fast pokemon and the suspect seems to be one "ninja" pokemon who has many tools at his arsenal. Read the story to see Ash, now known as the Mastermind, meet his old friend Greninja, now, as an enemy... Both of them try to finish each other, once and for all!