Bulbasaur and the Hidden Village - S1-E10
Continuity mistake: When Ash takes out his Pokédex to find facts about Oddish, the end of his right thumb is not over the center part of it, but in the next shot, it is. (00:02:14)
All Things Bright and Beautifly! - S6-E13
Continuity mistake: When the receptionist says that there are no more spots left in the Pokémon Contest, the part of her below her collar is white, but in the next shot it is blue. Also, there is a flowering pot at an end of a desk, but in the next shot, there is not. (00:04:14)
Continuity mistake: In the recap of the previous episode, when passengers are watching the St. Anne sink, some of them are constantly changing colour. (00:01:16)
Mystery at the Lighthouse - S1-E13
Revealing mistake: When the costume's left arm falls off, the shell is not fully colored in. (00:12:33)
Mystery at the Lighthouse - S1-E13
Continuity mistake: When Bill asks, "Who's there?" the intercom on the doorbell changes from blue to black. (00:06:38)
Charmander: The Stray Pokemon - S1-E11
Continuity mistake: When Damian says, "Just look at 'em," the pile of Poké Balls changes. (00:06:07)
Revealing mistake: When Ash goes to save the Pikachu in the river, he clips through his and Misty's bags. (00:05:25)
The Water Flowers of Cerulean City - S1-E7
Revealing mistake: In the localizations, when Ash and Brock begin running to the crime scene, part of the top of Ash is missing. (00:04:25)
Other mistake: When Ash and friends are first seen when a Ghost Pokémon laughs, the base on Pikachu's tail is missing. (00:07:47)
Other mistake: When Brock says, "Yeah. The season of love is when Butterfree lay their eggs," two Butterfree occasionally are missing feet, and another one occasionally has a part of its wings mistakenly colored black instead of white. (00:01:49)
Revealing mistake: As Ash, Misty, and Tracey are making their way through the crowd, Tracey clips through one of the people in it. (00:05:33)
Try to Study! Pokémon Trainer's School! - S6-E15
Continuity mistake: When Ash is first talking with Professor Oak, he does not have his rucksack, but in the next shot, he does. (00:05:25)
Battle Aboard the St. Anne - S1-E15
Continuity mistake: When people are watching the St. Anne sink, some of them are constantly changing colour. (00:19:56)
Battle Aboard the St. Anne - S1-E15
Continuity mistake: When people are watching the St. Anne rock, some of them are constantly changing colour. (00:19:36)
League Finals! Full Battle 6 vs 6!! - S5-E60
Continuity mistake: When Ash and Brock are at a table, the front Ash's hat is red, and the back is white, but in the next shot, the front of it is white, and the back is red. (00:09:28)
Mystery at the Lighthouse - S1-E13
Continuity mistake: When the doors to the lighthouse are initially opening, the placement of the Pokémon on them change between shot. (00:08:09)
Continuity mistake: When Ash, Misty, and Nurse Joy enter the storage room, Nurse Joy's left hand is not behind Ash, but in the next shot, it is. Also, the floor changes from a yellow floor that is not tiled to a green floor that is tiled. (00:14:15)
The Ninja Poke-Showdown - S1-E32
Revealing mistake: When Pikachu turns his head after a Venonat leaves, his left ear clips through Ash. Also, part of Ash's right leg is missing. (00:03:46)
Mystery at the Lighthouse - S1-E13
Continuity mistake: When Ash says, "I got it," there is no doorbell on Bill's Lighthouse, but in the next shot, there is. (00:07:17)
Clefairy and the Moon Stone - S1-E6
Other mistake: When the camera begins panning back to show Seymour, Ash, Butterfree, Zubat, and Brock, Pikachu's mouth is missing. (00:11:18)
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.