The bullies are a group of characters in Yu-Gi-Oh! The Movie.
The boys bullied Shougo Aoyama, by saying that never wins at Duel Monsters and playing with him is boring. The three were surprised when Shougo told them that he had the card "Red-Eyes Black Dragon".
At the end of the movie, they seem to have become friends with Shougo who, with his newfound courage, is seen dueling and having fun with them, along with Yugi, Jonouchi, Honda, Anzu and Miho.