For those of you with the English language games, the Mewtwo WiFi event is live a day early. This event is accessible by all English language games and is due to end on either February 26th or March 6th. This Mewtwo is special in that it knows moves it should learn at a later point and one it doesn't naturally learn: Psystrike, Shadow Ball, Aura Sphere and Electro Ball so be sure to get it while you still can. The
Event Database has been updated with these new details
Source:
Serebii.net - Where Legends Come To Life
Credit: Cube for telling me.