Happinas's Happy Nurse! - S3-E13
Continuity mistake: When a front door opens when Ash is next to it, the handle on the door to the right of it is pink, but in the next shot, it is white. Also, Ash's bag is medium-green in colour, but in the next shot, it is dark-green. (00:01:51)
Happinas's Happy Nurse! - S3-E13
Continuity mistake: When Ash is lying on the ground at the front of the Pokémon Center, the right door's handle is white, but when Brock is interested in Blissey when he is next to her, the handle is grey. (00:02:23)
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.