After winning against Burgh at the Castelia Gym Ash and co. head to Nimbasa City, home of the next Gym and Gym Leader Elesa. Next they have a run-in with their old friend Bianca, by bumping into Ash and knocking just him into the water. She informs them of a fishing contest in Castelia City and Cilan explores his newfound fishing possibilities. Little do they know that the contest was just another Team Rocket trick. Cilan chooses his rod with care. He later catches a Blue-striped Basculin. Will he keep it and why does that female Frillish like Ash so much?
This episode was originally supposed to air earlier but was delayed due to the 2011 earthquake in Japan, so the scene in Castelia City was removed and a scene of Bianca departing was inserted.
This is the second time a person looked up Frillish on the Pokedex. First was Ash he looked up on a Male Frillish in BW010: A Rival Battle for Club Champ! while Bianca looks up on a Female Frillish on the Pokedex.
Professor Oak's Live Caster: Scraggy
Who's That Pokemon?: Basculin (US)
In the end of the episode Bianca leaves, but in the start of the next episode she is again traveling with them. This is because the episode was aired out of production and chronological order.
The gang was surprised to see James using his Yamask in battle, despite seeing it prior to this episode. Again, this is due to the episode being aired out of production and chronological order.