Can't believe I haven't seen anybody do this one yet. Unless it results in immediate copyright-related deletion, in which case, I hope that doesn't happen to me.
Episode is 131 in the XY series (930 in the entire series together): Down to the Fiery Finish (Kalos League Victory! Satoshi's Ultimate Match!! in Japan).
Music is You Say Run by Yuki Hayashi from the My Hero Academy OST.