When Light and Dark Collide! (Japanese: ルチャブルとダークルチャブル!Luchabull and Dark Luchabull!) is the 51st episode of the XY series, and the 850th episode of the Pokémon anime. It first aired in Japan on November 27, 2014, and in the United States on February 7, 2015.
Spoiler warning: this article may contain major plot or ending details.
When Ash and Pikachu attempt to rescue a Snubbull from asinister Hawlucha, they accidentally injure the Gallade who's swooping in to protect Snubbull. That's when they discover that they've interrupted a rehearsal of a Super Pokémon Battle show! The director, Carl, explains that the show combines a Pokémon battle with a scripted storyline—but since one of his stars is injured, he’ll have to call off tomorrow’s performance.
Bonnie has a better idea: she suggests that Ash's Hawlucha step in to fill the role of the shining hero! Hawlucha has some trouble with the idea of a staged battle, but the show must go on. When the curtain goes up, Team Rocket tries to steal the show, but Hawlucha and Dark Hawlucha team up to blast them off. Then the two Pokémon clash with each other in an intense battle over "Lady Snubbull," and the Super Pokémon Battle show is a huge success!
Plot
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The episode begins with Ash and his friends continuing their journey to Coumarine City for Ash's next gym battle...