Pokemon XY&Z - episode 26 - 11 May, 2016

After meeting up with Sawyer again, Ash engages in a 3-on-3 battle with his rival, who has earned all eight Kalos Gym Badges required for the Kalos League. However, when Greninja battles Sawyer's Sceptile, the mysterious power between Ash and Greninja is unable to be triggered, leading to a victory for Sawyer. (Source: Wikipedia)