Tentacool and Tentacruel - S1-E19
Other mistake: After the Tentacool on Meowth says that Horsea must be punished, Meowth's mouth is missing. (00:14:38)
Tentacool and Tentacruel - S1-E19
Revealing mistake: When Brock says that Tentacruel is using Meowth as a puppet, his neck is not fully coloured in. In addition, while Tentacruel was holding Meowth, it was actually a Tentacool that was controlling him. (00:13:39)
Tentacool and Tentacruel - S1-E19
Continuity mistake: When Ash wonders where Misty went, the part of his hat that adjusts the size of it changes from red to white. (00:15:46)
Tentacool and Tentacruel - S1-E19
Continuity mistake: When Ash and his friends arrive in a boat to rescue the sailors, Brock's green vest turns black. (00:03:01)
Continuity mistake: When Ash sends out Pidgeotto and Caterpie, Ekans' yellow underbelly turns purple. (00:15:24 - 00:17:01)
Charmander: The Stray Pokemon - S1-E11
Continuity mistake: When Ash realises that he is standing on Misty and Brock, a hole appears on his left glove. (00:16:51)
Clefairy and the Moon Stone - S1-E6
Continuity mistake: When Zubat is hit by Koffing, the back of its wings changes from blue to purple. (00:08:36)
Continuity mistake: When Jessie says that Team Rocket is here to steal Pikachu, the tip on Meowth's tail disappears. (00:13:18)
Continuity mistake: In the previous episode, when Ash throws the Poké Ball, he says, "Poké Ball, go." However, in this episode, he says, "Caterpie, you're mine!" instead. In addition, in the previous episode, he had his bag on, but in this episode, it is missing. (00:01:17)
The Ninja Poke-Showdown - S1-E32
Continuity mistake: When Pikachu tries to remove the webbing on himself, part of Charmander's yellow underbelly turns orange, like the rest of his body. (00:15:35)
The Ninja Poke-Showdown - S1-E32
Other mistake: When the floor in the slanted room tilts, Ash and his friends tilt, but the trapdoor does not. (00:15:19)
The Ninja Poke-Showdown - S1-E32
Continuity mistake: When Ash asks Aya to remove him from the wall, Misty's blue eyes turn white. (00:07:19)
The Ninja Poke-Showdown - S1-E32
Continuity mistake: After Aya slaps Brock, Misty's bag disappears. (00:06:52)
The Ninja Poke-Showdown - S1-E32
Continuity mistake: When Ash and his friends notice a Venonat, Ash's bag disappears. (00:03:34)
The Ninja Poke-Showdown - S1-E32
Continuity mistake: When Brock opens the door to the mansion, he is to the right of Ash, while Misty is to the left. But in the next shot, they swap places. (00:03:02)
Electric Shock Showdown - S1-E14
Audio problem: When Ash thanks Lt. Surge, he speaks without moving his mouth. (00:19:22)
Electric Shock Showdown - S1-E14
Continuity mistake: After Pikachu dodges Raichu's first Body Slam, Jessie's green earrings turn blue. (00:16:53)
Electric Shock Showdown - S1-E14
Continuity mistake: When Ash says Pikachu might be able to beat Lt. Surge, part of the white bow on Nurse Joy's apron turns pink like her dress. (00:11:22)
Electric Shock Showdown - S1-E14
Revealing mistake: When Lt. Surge sends out his Raichu for the first time, the screen freezes for a few seconds. (00:06:29)
Electric Shock Showdown - S1-E14
Audio problem: When Nurse Joy walks over to Ash, she speaks without moving her mouth. (00:11:04)
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.