Fushigidane and Fushigidane! Regaining the Monster Balls!! - S7-E34
Other mistake: The English title card misspells Poké Balls as "Pokéballs." (00:02:41)
Fushigidane and Fushigidane! Regaining the Monster Balls!! - S7-E34
Continuity mistake: When Ash and friends first have a conversation with Professor Oak, Ash is not there, but in the next shot, he is. (00:05:08)
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.