Ep. 56: The Lonely Deino!

56

Ash and Co. encounter three irate Dark & Dragon-type Pokémon named Deino, who like to cause trouble for other trainers. They soon learn that a trainer named Bobby, who runs a Pokémon Day Care, is watching over them until their trainers return. When the third Deino's trainer doesn't return, Iris expresses interest in cheering it up. (Source: Wikipedia)