Its actually easy, LM, EM, WM can generate chakra the best
Also, the description for Shizuka when she was released here was wrong, we had the 2nd one listed the whole time.
And last, if you use her mystery while having 50 chakra at least, her mystery is buffed aka have 60 chakra then use her mystery and it would count. Or at least it did when I played with her.