Yuna had stealth aiding her. She was able to move through crowds of enemies unnoticed and pick them off one by one to give herself some leeway.
However, Juno and Valerie only had one thing to rely on.
As someone who used fire, Juno's fight against the Liqua Clan geniuses was the same as August's fight against Raphael. He could win against all of them as long as he could produce powerful laws.
On Valerie's side, water was naturally supportive of wood. Technically, they wouldn't be able to harm her as long as she used their laws to enhance her own. Of course, the Liqua Clan's water was acidic and incompatible with life, but Valerie could dissect the essence of the law and find the pure essence of water within, destabilizing their attacks and empowering her own.
Obviously, that was just as hard as it sounded.
Valerie knew what she needed to do. It was easy to theorize about how to defeat these people.