Title: Tesseed Institute! Iris and Bivanilla!! (テッシード研究所！アイリスとバイバニラ!!) 
Air Date: May 31, 2012 
Summary: The group meets up with Dragon Buster Langley has a Bivanilla now. They travel to the Tesseed Institute to see the Moss Pokémon Tesseed being studied, but when an accident forces an evacuation, Iris, her Kibago, Satoshi's Mijumaru, and Langley's Bivanilla are trapped inside. Iris has not yet overcome her crippling phobia of Ice-Types, and she must figure out a way out with Bivanilla at her side. 
Source: Wikipedia