Electric Wind God Fist, Kronin. It's basically the best move in the Tekken series. Super fast, super strong just-frame mid punch that beats out like everything and can combo into itself like 20 times.
Thanks for the answers Nightpup and Force_of_Nature, I've to admit that it's the first time that I heard about it: now I've already made more researches about it.
I'm not a good player of Tekken, is it so obvious? XD
I """main""" (the triple quotation marks are not a typo XD) a Kangaroo and a Cyborg girl, so I believe that I will be more careful next time that I will meet online a Mishima.