Gourgeist was sent out by Cassius, as he saw the commotion outside, to battle the Espurr. It used Confuse Ray on one of them and grabbed the other four with its ribbon-like arms. Clemont used his Aipom Arm to lift of their ears, to the caution from Cassius, which sent Clemont flying into the air, due the power Espurr store in their ears. Disobeying him and questioning why he should take orders from him, Cassius sent out Gourgeist against X's Elec and had it wrap its arms around it. Cassius told X that he had his own plans and he couldn't allow him to interfere with the search of X's "girlfriends" mum, while Gourgeist was panicking as Elec holding onto one of its arms with its jaw.
Later on, while everyone was inside the helicopter Cassius picked up from the Battle Chateau, Gourgeist was seen inside, along with Elec, too. When the helicopter crashed, Gourgeist got out of it and when Cassius tried to call his gang to get his car. When everyone, decided to go looking for Y, Trevor wrote a letter telling where they've gone which he gave to Gourgeist to give to Cassius.
Cassius came to save Emma. Since Lysandre tried to take control of her as Essentia, Gourgeist fired Shadow Ball, which destroyed his device. It also watched with Emma and Cassius how X battled Lysandre.
|Confuse Ray||Morphing Manectric|
|Shadow Ball||Zygarde Agitated|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.