Since I rarely play with smash balls, I'd rather she could transform without it, but most transformations are final smashes so it feels like that'd be the trend.
It's nice to be more powerful, but I dunno if I'd want to remove a b-move for it. If it's like that, I think it should have at least 2 special/magic moves usable before reverting, unlike cloud, or perhaps just a time limit.
The best case scenario would be that it doesnt take a b-move, but when she has enough magic power, you hold a b button or something to transform, and still have all skills on b moves