This trophy is fairly self-explanatory if you know the lingo behind it. First and foremost, C equates to circle using default controls. If you've changed your controls, simply default them for this trophy. Secondly the part "6" refers to number pad inputs, which are commonly used to describe special moves in fighting games. When starting from the left, this would mean pressing towards the opponent and pressing Circle. If you're on the right, press left and circle. You'll know you've done it when Rachel twirls and hits for one or two hits. This attack doesn't do much damage, so you can easily land it 30 times in one round however having the rounds set to two can't hurt. This can be done in either Arcade or Local Versus modes.