Easiest way that I found to do this, is using
Bob because of his powerful combo that is very easy to do! The combo is called the
Three Star Combo. Located at 046/095 on the command list.
All you have to do is hold
and be pressing
and
at the same time 3 times in a row! He does this combo which will take away a fourth of their health everytime you do it! You might need to do a leg sweep every once in awhile, because they like to block after the 2nd or 3rd time you do it.
Keep practicing with this, and you'll get by with no trouble! I got this after my 2nd attempt after getting to battle 9 on my first!
I tried using
Kazuya, but his
Roundhouse to Triple Spin Kick didn't do that much damage.