"That won't do." Nalu shook her head. "From now on, you two need to make a point of training Water Shuriken. It's an extremely powerful Water-type special move. Train it well, and you can turn it into a killing move."
"My master has an incredibly powerful Greninja. Even a casual Water Shuriken from it can split mountains and cleave stone. It's so fast and so powerful that even I can't defend against it," Nalu said seriously. "At your current stage, the first thing you need to do is work hard on improving accuracy. I'm not saying you have to fire five Water Shuriken every single time, but at the very least, you need to make sure you never fall below three."
"That... doesn't seem very realistic..." Cheng Tian pulled a long face. He knew all too well how rotten his luck was. If Water Shuriken didn't guarantee at least two shots, he figured he might even end up with just one...
"A move's accuracy can indeed be improved through training," Nalu said. "Although that takes a very long time, if you want a better chance of hitting your opponent right now, you need to work on quantity. Greninja, let me ask you: can you only use two Water Shuriken?"
"Gren..." Greninja shook its head. In fact, before using Water Shuriken each time, it could roughly judge how many shuriken would hit its opponent from that angle and at that moment without wasting any. If quantity was all that mattered, it could throw five every time, but whether they would hit was another matter.
"Ah, don't worry about that little bit of stamina from now on. Just make sure you're putting out as much as possible," Nalu said. "You develop a feel for it gradually through practice. The more you throw,