Pokémon S10 E03 When Pokémon Worlds Collide!

"Gotta catch 'em all!"

While searching for Pikachu, Ash and Brock run into a new rival named Paul, who challenges Ash to a battle, but Ash can't compete without Pikachu; Dawn and Piplup meet Ash and Brock, and together they try to rescue Pikachu from Team Rocket.