With the Clubsplosion Tournament behind them, Ash and co. set out for Icirrus City once again. During a battle with Iris' Emolga, Ash's Swadloon evolves into Leavanny, and gains a habit of making clothes out of leaves for all of their Pokémon. Including the three Sewaddles they've saw when their leaf clothings a bit worn out. As Leavanny make new clothings for them, Ash remembered the Castelia City Gym Leader Burgh and his Leavanny who made leaf clothing for his Sewaddle too. However, his clothes make some Durants mistake Iris' Axew and the other leaf clothings for food and takes all of them away to their nest. Will Ash and co. get Axew back from those Durant? And can Leavanny keep its habit under control and find a way inside Durant's nest?
Like the Greek legend of "Theseus and the Minotaur", Leavanny used its own thread to attach the wall and make a trail from the Durant den entrance so that Ash and co. could find their way out through a tunnel-like labyrinth.