While there isn't any single 'best' charm loadout for this or any other quest, there are a couple general guidelines that can bolster the Knight's chances for success. Using the Dreamgate costs 1 essence, and does not reset enemies. Place the Dreamgate by holding Down on the D-Pad while also holding the button associated with the Dream Nail.
To acquire the Dreamgate, simply visit the Seer once the Knight has collected 900 essence.
This will allow the knight to immediately return if the flower is destroyed. Before embarking on the Delicate Flower quest, the first step the Knight should take is placing the Dreamgate just outside the home of the Grey Mourner.
