Super Smash Bros. for Wii U: Offline: Carls493 (Greninja) vs. aceman (Mewtwo)
There are some webcomic strips that explain that Greninja's water attacks are powered by Mewtwo's tears. The tears he had before he was confirmed for DLC.
http://38.media.tumblr.com/e03cab7745c00db147017dd0e420321a/tumblr_n3wh4wkBQQ1tof0fso1_1280.png
http://i.imgur.com/mkABf37.png
^Those are just a couple of them.
On top of that, Greninja's part-Dark type, so Mewtwo's Psychic attacks shouldn't even phase him. But for the sake of the much-improved balance this game has, they do.
Mewtwo better watch out for Lucas, too, come June.
http://orig12.deviantart.net/79f6/f/2015/091/7/4/be_strong_for_mother_by_dragonith-d8o2469.png
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Carls493 currently has 279,825 views spread across 1,251 videos for Super Smash Bros. for Wii U. His channel uploaded over 3 days worth of Super Smash Bros. for Wii U videos, roughly 3.40% of the content that Carls493 has uploaded to YouTube.