S16·E13 The Name's N!

On a boat heading to see ruins dedicated to Reshiram, Ash, Iris, and Cilan meet the mysterious boy calling himself N, who quickly befriends their Pokémon. However, when Team Rocket attacks the group once more and James's Amoonguss paralyzes Pikachu with Stun Spore, N's timely intervention helps turn the tide of the fight.