Pokémon — Episode 26: Battling the Leaf Thieves!

You are watching the episode Battling the Leaf Thieves! During a practice match against Iris' Emolga, Ash's Swadloon evolves into Leavanny. Leavanny's leaf-sewing process causes it to make costumes for the other Pokémon, but this causes Axew to be accidentally kidnapped by a pair of Durant who are building a den. They stop to think about how they are going to enter the Durant's den, and to be able to rescue Axew.