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Continuity mistake: When Ash and friends are first at the Pokémon Center, they are near a puddle towards the end, with Ash almost about slip on it, but in the next shot, they have moved to being far enough away where he is not about to slip on it. (00:06:07)
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.