Hanecco's Jealousy! Battle in Big Prairie!! - S3-E21
Continuity mistake: When Ash says, "There's a couple of Gloom over there!" Pikachu's mouth is open, but in the next shot, it is closed. Also, Misty is not smiling, but in the next shot, she is. (00:01:29)
Hanecco's Jealousy! Battle in Big Prairie!! - S3-E21
Continuity mistake: When Ash uses his Pokédex to find facts on Hoppip, the end of his right index finger is covered by it, but in the next shot, it is not. (00:01:52)
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.