The Case of the K-9 Caper - S1-E52
Continuity mistake: When zooming out on Officer Jenny when she is in the police station, there is no spatula on the wall, but in the next shot, a spatula appears. Also, the last character on the paper to the left changes. (00:04:15)
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.