in Yuuki's case she can power up without singing, either using Sword Dance or Nasty Plot
Well, because she's not a normal human
the only thing Yuuki didn't liked when she evolved in Zoroark was losing her tail
Why? Less cute?
if you say so, is more likely because she liked how fluffly it was, but hey Yuuki's haird got more fluffy when evolving
oh, i see
fortunately for her, Mangle's not picky in appearance after all is personality that matters
I gotta agree on that thing