Place the Law of Consistency Sealstone in a dais prior to the battle in Asgard to prevent Freya using her dangerous Exact Emotion technique. This battle has no real strategy but survival. Avoid her attacks and stay healthy. Also avoid launching techniques as they will cause Freya to fly higher than wanted. Knockdown moves guarantee an ground bounce however. Once Freya is at less then 50% HP, she will launch her Ether Strike Soul Crush to end the battle. Enjoy the ensuing cutscene.