Mantle

マントル

Mantle is the character of the day featured in Rotom's Wish!.
Ten years ago, Mantle and his gang of crooks attended the opening of the Lost Hotel. Mantle forced the hotel's owner, Weston, into a battle, claiming ownership of the hotel if he won. He chose to battle with his Krookodile, but Weston's Pokémon, a Rotom, was scared by the sight of Krookodile and fled into an air vent. Consequently, Mantle claimed victory by default and took over the Lost Hotel. He appointed Weston as a counter clerk and used the hotel's battlefield to challenge visitors, taking their Pokémon if he won. Under Mantle's ownership, the Lost Hotel fell into a state of decay.
In the present day, he and his Krookodile were battling a visitor and his Pangoro when Ash and his friends arrived. Ash, angered by Mantle's unfair method of taking Pokémon from others, confronted him. In response, Mantle forced Ash into a Pokémon battle, claiming Ash's Pikachu if he won. Before the battle could begin, however, Weston's Rotom emerged from a trash can and led Ash and his friends away. Rotom revealed what Mantle had done and subsequently managed to send them ten years back in time to try to change the past and set things right.
In the past, Ash intervened when Mantle claimed victory by default after Rotom had fled. Mantle granted Ash and his friends five minutes to try to get Rotom back to battle against Krookodile. They managed to find Rotom, and Weston got Mantle to promise that if Weston won, he would never steal other people's Pokémon again. During the battle, it seemed as if Rotom got scared again, but in fact, it entered multiple appliances in the hotel's storage room, allowing it to form change and gain a type advantage over Krookodile.
After a hard-fought battle, Rotom was able to defeat Krookodile. Mantle did not accept his loss, however, and refused to keep his promise. But after being shocked by both Rotom and Pikachu, he surrendered, thereby changing the past and ensuring Weston remained the owner of the Lost Hotel. Following this, Rotom brought Ash and his friends back to a changed future. In the revised present, Mantle and his henchmen were shown to be well-mannered employees of the Lost Hotel.