What does it mean to use Substitution Jutsu?

I'm stuck on the the mission "Sakura's Training" (C-rank I think) where one of the conditions is to use the Substitution Jutsu more than 6 times. What does it mean by that? Does it mean use the item Substitution Justu more than six times, or obtain the item Substitution Jutsu more than 6 times, or block when an enemy attacks you and teleport behind them, or do additional blows and teleport behind them when they try to strike you, or what?

Solution 1:

From doing research into this, I have determined the Substitution Jutsu the game refers to is where you teleport just as your opponent tries to hit you.

Substitution Jutsu: Hit the L2 or R2 button just before you enemy hits you.

Note: The link contains spoilers.