Mistralton City Mistralton Gym. Mistralton Cave is a forgotten cave in Unova, said to be sealed with hints of a legend's presence. Audio: 175957623 The player must first go talk to Skyla at the top of the Celestial Tower and ring the tower's bell before she'll return to the Gym so it can be challenged.. Milfy City Walkthrough – Liza & Jazmin. Thanks Mom! Remove ads and unlock special features, TM58 Sky Drop, Sharp Beak, Parlyz Heal, Repel, Max Ether, TM40 Aerial Ace (after Gym).