Dunsparce would definitely not replace Brigette at all because you can't use its attack turn 1, but you can use Brigette turn 1. Also, if you don't start dunsparce, you would have to find a way to retreat your active after searching dunsparce, and still be able to attach an energy to dunsparce, AND you would have to have gone second for it even matter (since going first you can't attack with dunsparce), meaning you're already at a disadvantage because you'll be evolving your stuff after your opponent does. Brigette is still much much better than dunsparce.