Pokemon Black & White Episode 21 The Lost World of Gothitelle

Ash, Iris, and Cilan finally arrive at the Skyarrow Bridge, which is enshrouded in a thick fog. Before crossing it, they come across a woman looking at photos of a ferry crossing in the Pokémon Center. They prepare to cross the bridge when they are attacked by a Gothitelle. Ash sends out Snivy, but she cannot defeat the stronger Pokémon, and they are all sent back to the other side. There, they meet a young girl named Sally, who invites them to take her father's ferry to the other side. Cilan notices the Gothitelle on board and when the ferry docks again, the group realizes that they are back where they started and that the Gothitelle is creating illusions to make them think that the ferry and the little girl exist. When Iris spots the Gothitelle again, they chase it onto the Bridge, where it attacks them. Ash sends out Snivy until the woman from before arrives, revealing that she is Sally and that the Gothitelle that they have met helped out her father's ferry business until the bridge was opened. Sally apologizes for leaving Gothitelle behind, and as the fog disappates, Gothitelle disappears. Ash, Iris, and Cilan say their goodbyes to Sally as they head off towards Castellia City.