Sky Balance begins appearing in battles in the second half of the Arqa Block in Tartarus, from 41F onward. They will later appear inside the love hotel on Shirakawa Boulevard during the July 7 Full Moon Operation.
Sky Balance appears on the 9th and 10th floors of Marukyu Striptease in the Midnight Channel. Unlike its predecessor in Persona 3, it will repel everything except Fire-based and Almighty attacks. Like other Balance enemies, it will typically target the protagonist whether the attacks are effective or not. After defeating a Sky Balance it may drop the Fashionable Dish material. Selling 6 Fashionable Dishes at Daidara will unlock the unisex Hard Armor in the shop's inventory.
For Quest #27: Acquire Some Fashionable Dishes, the protagonist must acquire 3 Fashionable Dishes from Sky Balances, or may simply turn over some that are already in his inventory.
In Golden, it may also drop Olive Stones for trade at the Shiroku Pub.