Pokemon XY EP81 - Rotom's Wish!

Ash and the others check in to run-down hotel, where its owner Mantle wagers Pokémon as prizes for battles. They meet a timid Rotom once owned by the front desk clerk Weston. Rotom uses a television to show Ash and the others that ten years ago at the founding of the hotel, Weston had lost ownership of the hotel to Mantle by forfeiting a match after Rotom was scared off. Rotom sends Ash and his friends ten years into the past to change history.