Pokemon XY&Z - episode 28 - 25 May, 2016

Following his disastrous defeat against Wulfric, Ash reflects on his recent failures and shortcomings alone in the forest. As his friends search for him amidst a fearsome blizzard, an encounter with a certain Pokémon reignites Ash's passion, not only allowing him and Greninja to master their unique power, but also enabling Ash to reaffirm his desire to become a Pokémon Master. (Source: Wikipedia)