How do I get a brave bs?

Urm that's its full name right? I want to use it on my a.l.e jkun because the garapon has decided I don't need anything easier to use >.>( I want that elisalotte....)

But ALE Jikun is ez.
Brave Dive BS is a garapon prize.

But whenever I use her, it becomes how to die 101. Should I just make a hit and run build.(I need mats for tuning.)

Brave BS ALE jikun does nothing of value. Your only option is assasination because she's too squishy to crowddive.