
Continuity mistake: When Ash takes out his Pokédex to find facts on Quagsire, it and his right hand clip through him. Also, his right sleeve goes from being all white to white and blue and his right jacket strip goes from being present to being absent. (00:02:09)
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.