Natio's Big Prediction! - S5-E25
Revealing mistake: When Ash takes his Pokédex out, his right hand clips through his right trouser pocket. (00:03:26)
Revealing mistake: In the English dub, towards the end of the intro, May is slightly transparent and Max's left arm can be seen through her. (00:01:54)
A New Land! A New Adventure!! - S6-E1
Revealing mistake: In the English dub, during the "Who's That Pokémon?" segment, part of Lanturn's tailfin is cut off. (00:11:39)
Revealing mistake: When Ash is first seen, his hands clip through him. (00:00:02)
Revealing mistake: When Ash says, "Seems almost magical," the end of Pikachu's tail is missing. (00:03:59)
Revealing mistake: As Seviper slips back into the bush after Torchic trips on its tail, the end of its tail is cut off. (00:03:16)
Revealing mistake: When Ash and his friends run into the Pokémon Center, a line is briefly layered over them. (00:07:06)
Revealing mistake: When first revealing a Lotad, the Lotad appears from nowhere. (00:02:10)
All Things Bright and Beautifly! - S6-E13
Revealing mistake: When Ash opens a door, Pikachu's tail clips through the doorway and wall. (00:11:26)
Try to Study! Pokémon Trainer's School! - S6-E15
Revealing mistake: When Ash says, "No problem!" in response to Roxanne asking if it is all right to postpone his match at the Rustboro Gym, Pikachu's mouth duplicates. Also, Ash and Roxanne go from being 90 centimetres from each other to being 30 centimetres away. Additionally, the former's bag goes from being present to vanishing. (00:06:18)
Try to Study! Pokémon Trainer's School! - S6-E15
Revealing mistake: When Anita says that Kenny does not care about Pokémon either, she is sitting in midair. (00:09:46)
On a Wingull and a Prayer - S6-E18
Revealing mistake: At the beginning of the episode, when Pikachu speaks, his mouth duplicates. (00:00:05)
Which Wurmple's Which? - S6-E21
Revealing mistake: When turning to agree with Brock, May and Max duplicate. (00:07:19)
Banana Namakero Park and Kabigon!! - S7-E48
Revealing mistake: When Ash puts his hands on the gate, some of his fingers clip through it. (00:02:27)
Island of Doctor Moroboshi! Fossil Pokémon Appear!! - S8-E10
Revealing mistake: When Armaldo leaves the laboratory, it clips through a wall. (00:12:13)
Okido Laboratory! All Members Assemble! - S8-E41
Revealing mistake: When Professor Birch says that Muk should play with the other Pokémon, his mouth briefly detaches from his face. (00:06:23)
Evolution! That Mystery and Wonder!! - S8-E50
Revealing mistake: When Caterpie leaves the laboratory, it clips through it. (00:09:20)
Evolution! That Mystery and Wonder!! - S8-E50
Revealing mistake: When the jeep lands onto the ground, part of Max's glasses are missing. (00:16:51)
Revealing mistake: When Solana removes her phone from her pocket, part of the strap on it is missing. (00:03:47)
Haruka Travels Through Time!! - S9-E12
Revealing mistake: When Edna gets her parasol, it teleports to her. (00:05:34)
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.