Antagonists and protagonists? Antagonists is the bad guy and protagonists is the good guy, right?

When the basket was passed to him, Messer grabbed a stick while thinking about the second question Professor was asking. He put the stick in his left hand and raised his right hand up in the air. "Professor, there's this Muggle movie called Sherlock Holmes: A Game of Shadows. Sherlock Holmes, a detective who also the protagonists in this movie, accompany by his sidekick Dr. Watsonjoin forces to outwit and bring down their opponent, Professor Moriarty, who is the antagonists character in this movie." he said before lowering his hand.