BW025: Battling for the Love of Bug-Types!

Synopsis
After the events of the last episode, Ash finally has his battle with Burgh at the Castelia Gym. Meanwhile, though disbanded, Jessie, James and Meowth search for their boss Giovanni. James finds a Yamask and feeds it. After this act of kindness, Yamask is caught by James. During the Gym Battle, Ash's Sewaddle evolves into Swadloon and with it, Tepig and Pikachu, Ash wins the battle and the Insect Badge.

Trivia

 * This is the first episode where a main character's Pokémon evolves during a Gym Battle.
 * This episode was supposed to air two weeks later but was bumped after the episode "Team Rocket vs. Team Plasma"'s delayment.
 * Team Rocket returns to their old uniforms (forgoing the dark trench coats), but keep their gadgets & seriousness.
 * This is the second time Ash's Oshawott got shocked and fainted by not being chosen. The first time was back in BW001: In The Shadow of Zekrom!
 * This is the first time, in the entire BW series, James shows his kind side to a Pokémon.
 * James caught his Yamask the same way he caught his Cacnea by feeding it. This is the second time James has captured a pokemon by using this method