Rotom's Wish!

While visiting a hotel on their way to the next town, Ash & co. encounter a place where battles are held using Pokémon as gambling pieces. Ash is challenged to a battle by the head of the hotel, only to discover that he has to use Pikachu as a betting chip. Ash doesn't wish to risk it but is luckily saved by a Rotom who leads him to an elevator, but when they get off the elevator, it turns out that they are in the past. Will they be able to return to the present?