Title: Rescue Kibago! The Den of Aiant!! キバゴ救出！アイアントの巣窟!! 
Air Date: April 12, 2012 
Summary: During a practice match against Iris' Emonga, Satoshi's Kurumayu evolves into Hahakomori. Hahakomori's leaf-sewing prowess causes it to make costumes for the other Pokémon, but this causes Kibago to be accidentally kidnapped by a pair of Aiant who are building a den. 
Source: Wikipedia