The Water Flowers of Cerulean City - S1-E7
Continuity mistake: When a person says, "Uh, some burglars broke into that store last night," there is a woman with a yellow shirt and brown hair, and a man with a yellow jacket, but in the next shot, the woman has a blue shirt and orange hair, and the man has a blue and cream jacket. (00:04:29)
The Water Flowers of Cerulean City - S1-E7
Continuity mistake: When Brock asks, "Shouldn't you head for Cerulean City Gym?" a street lamp goes from being present to being absent. (00:06:14)
Answer: He is a good guy but just found himself in a bad situation when he worked for Lysander. He didn't want him to harm Ash and his Pokémon when he was trying to get the special bond between Ash and his Greninja to work. He does leave Lysander and go back to being a good person.