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)
Continuity mistake: When Ash sends out Pidgeotto and Caterpie, Ekans' yellow underbelly turns purple. (00:15:24 - 00:17:01)
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)
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: 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)
Continuity mistake: When Jessie says that Team Rocket is here to steal Pikachu, the tip on Meowth's tail disappears. (00:13:18)
The Ghost of Maiden's Peak - S1-E20
Continuity mistake: When Ash asks, "You remember where we're staying tonight, right?" Brock's bag is on dirt, but in the next shot, it is on grass. (00:08:37)
Battle Aboard the St. Anne - S1-E15
Continuity mistake: When the Gentleman says, "That's enough," he has his left hand behind the left whiskers on Raticate, but in the next shot, it is below them. Also, the sign indicating a win has vanished from the end of the match before Ash's. (00:08:42)
The Path to the Pokemon League - S1-E8
Other mistake: When A.J. is grateful when Sandshrew returns, his Butterfree's antennae are missing occasionally. (00:15:24)
Charmander: The Stray Pokemon - S1-E11
Continuity mistake: When Nurse Joy checks Charmander's heart rate, Charmander's flame is missing occasionally. (00:10:48)
Charmander: The Stray Pokemon - S1-E11
Continuity mistake: After Ash says, "According to my calculations, it does," the map he is holding changes design between shots. (00:02:10)
Continuity mistake: When first showing a clock, the edge of the roof is medium-brown, but in the next shot, it is dark-brown. (00:06:42)
Pokemon, I Choose You! - S1-E1
Continuity mistake: When Pikachu uses Ash's Pokédex for facts on where Pokémon want to reside, Ash's right fingers are covered by it, but in the next shot, they are not. (00:10:19)
Pokemon, I Choose You! - S1-E1
Continuity mistake: When Misty turns to look at her bicycle, the left pedal on it is higher than the right one, but in the next shot, it is lower than it. (00:16:43)
Pokemon, I Choose You! - S1-E1
Continuity mistake: When Ash leaves on the bicycle, his zipper line is black, but when he says,"I'll give it back someday!" the zipper line has changed to green. (00:17:05)
Pokemon, I Choose You! - S1-E1
Continuity mistake: When Gengar dodges, there is a Poké Ball pattern on the field, but in the next shot, it disappears. (00:01:57)
Pokemon, I Choose You! - S1-E1
Continuity mistake: When the camera pans to Ash for the first time, the television set is aligned with what it is on, but in the next shot, it is skewed. Also, there is no wood framing around the window to the right of Ash, but in the next shot, there is. (00:02:04)
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)
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.