critical will up if using kaioken 2x or more (press kaiokein 2 times or more). if u using more 2x or over, example : kaioken 10x
that skill just increasing ur critical.
I don't think someone knows that... Also why do you want to know that ? It's not very important, all you need to know is that improves your hit rate, attack dodge and i think your speed.
Correct. Physical attack increases, Energy attack increases, dodge rate, and hit rate. (I think around the 25%, but don't take my word for it)
Most importantly, though, the runspeed increases by about 50%, and attack speed roughly doubles. The speed is the reason why SSJ is usefull, the attack and dodge bonusses are just a nice extra.