Ep. 42: Rocking Kalos Defenses!

42

Ash and Alain continue their battle against Lysandre, succeeding in defeating Mega Gyarados. Meanwhile, Chespie is absorbed by the Megalith Crystal in Lysandre Labs, which transforms into a giant Megalith Zygarde. The Megalith Zygarde then proceeds to head toward Anistar City to absorb the power from the Anistar Sundial, which will result in a planetary apocalypse. Ash, Clemont, Serena, Alain, Sycamore, Malva, Steven Stone, the Kalos Gym Leaders, and the Kalos League Champion Diantha join forces to defeat the Megalith Zygarde. (Source: Wikipedia)