Queen of the Serpentine! - S9-E13
Revealing mistake: When the title appears, it is duplicated. (00:01:17)
Pokémon Contest! Yuzuriha Convention!! - S9-E17
Revealing mistake: When Jessie walks over to May after she wins against her, Mime Jr's eyes and mouth are briefly missing. (00:14:06)
Revealing mistake: When Aipom runs off with the crown, its tail passes through a wall. (00:07:34)
Ancient Pokémon Rampage! - S10-E17
Revealing mistake: When Ash's Pokémon turn after he compliments their battling, Turtwig appears to be floating in midair. (00:01:33)
Ancient Pokémon Rampage! - S10-E17
Revealing mistake: When Buneary jumps down from a rock, it passes through it. (00:01:39)
Save the Lost Hippopotas! - S10-E44
Revealing mistake: When Ash and his friends are digging, Ash overlaps Brock. (00:14:52)
Satoshi and Butterfree! Until the Day We Meet Again!! - S16-E33
Revealing mistake: In the close-up of Ash and Metapod running to the cliff at night, part of Metapod is cut off several times. (00:15:12)
Fierce Battle in the Monster Ball Factory! Pikachu VS Nyarth!! - S18-E34
Revealing mistake: When Ash and his friends put all their Poké Balls in the case, Bonnie's hands are briefly drawn like Clemont's. (00:03:04)
Fierce Battle in the Monster Ball Factory! Pikachu VS Nyarth!! - S18-E34
Revealing mistake: After Pikachu points to Ash's friends, Ash's left hand passes through him. (00:17:39)
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.