Island of the Giant Pokemon - S1-E17
Other mistake: When Ash wakes up on the beach, part of the sides of the hat overlaps the front. (00:01:53)
Continuity mistake: When Team Rocket begins reciting their motto, Jessie's gloves disappear. (00:06:42)
Continuity mistake: When Ash and his friends recall their Pokémon during their battle with Team Rocket, Ash's left glove disappears. (00:07:58)
Continuity mistake: When Ash and his friends escape the ship, Ash's gloves disappear. (00:12:44)
Continuity mistake: When Ash and his friends paddle away from Gyarados, the tips on Meowth's feet disappear. (00:18:52)
Continuity mistake: When Jessie tells Ekans to use Acid, the stripe on its tail disappears. (00:04:45)
Continuity mistake: When Meowth says that Jessie and James picked a bad place for their nap, the black edge of his ears turns cream. (00:04:04)
Battle Aboard the St. Anne - S1-E15
Continuity mistake: When Jessie insults James for getting tricked by the salesman, she appears in her regular clothes, instead of her disguise. (00:12:12)
Battle Aboard the St. Anne - S1-E15
Continuity mistake: When Ash is impressed on seeing the inside of the cruise, his bag disappears. (00:05:57)
Mystery at the Lighthouse - S1-E13
Continuity mistake: During the motto, James' purple belt turns white in one shot, and shortly after, Meowth's cream forepaws turn orange. (00:11:38)
Mystery at the Lighthouse - S1-E13
Continuity mistake: When Misty says that the lighthouse will probably have extra beds, her suspenders disappear, while the purple strap on her bag turns red like them. (00:06:49)
Mystery at the Lighthouse - S1-E13
Continuity mistake: After Krabby's Poké Ball disappears, the white stripe on Ash's bag turns orange. (00:05:05)
The Path to the Pokemon League - S1-E8
Continuity mistake: When Team Rocket is sneaking around the Gym while inside a ball, Meowth's cream forepaws turn orange. (00:12:44)
The Path to the Pokemon League - S1-E8
Character mistake: In the English dub, when Ash says that Sandshrew are weakened by water, he incorrectly refers to them as "Sandshrews." The plural of a Pokémon is the same as the singular. (00:09:05)
The Path to the Pokemon League - S1-E8
Revealing mistake: When Ash and his friends turn to A.J., Ash's left hand passes through Brock. (00:03:00)
The Water Flowers of Cerulean City - S1-E7
Character mistake: Lily and Daisy say that Misty wants to become a Pokémon Trainer. However, she is already a Pokémon Trainer. Her true goal is to become a Water-type Pokémon Master. (00:11:30)
The Water Flowers of Cerulean City - S1-E7
Audio problem: When Misty jumps from the stands, she speaks, but her mouth does not move. (00:10:40)
The Water Flowers of Cerulean City - S1-E7
Audio problem: When Ash tells Brock to follow him, his mouth does not move. (00:02:43)
Showdown in Pewter City - S1-E5
Continuity mistake: When Flint tells Ash to come with him, Ash's gloves disappear. (00:08:15)
Showdown in Pewter City - S1-E5
Continuity mistake: When Team Rocket is wondering where the trap is, Jessie's right glove changes from black to skin-colour. (00:01:46)
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.