Hmmm...? What is it? What? A new skill? How... did you find out...? Ahhh... no one should have known this... well, well... there is a skill indeed, but it's too dangerous for someone at your level, so maybe later...
1) I still want to learn the skill.
2) Since you say it's too dangerous......

Really? Hahaha! That's what I'm talking about! That's what a Thunder Breaker should do! I'll tell you how to do it, as long as you can prove to me that you are capable of handling this skill. All you need to do is pass the test, but the test is dangerous enough where you could even lose your life over it. Do you still want to do it?

Wait, I didn't expect you to back out that easily. It's just a test...

Go to [map 130020000], and you'll reach the 3rd Drill Hall. Take the test that's set up there, and bring back , okay? Then I'll teach you the new skill.

Are you not ready for it? A true Thunder Breaker takes every challenge in stride and finds a way to overcome it, okay?

Whoa, you brought it back!! Are you okay? Is your EXP in tact? Wow, I am surprised! At least you proved to me that you are worthy of learning this new skill. Here it is!

I will teach you a new skill for the Thunder Breakers, Barrage! Use it well, you understand?

Were you not able to find ? Go to the 3rd Drill Hall at [map 130020000], and you'll find it there! Getting it would be the hard part, but keep going.