Here Comes the Squirtle Squad - S1-E12
Continuity mistake: When Officer Jenny says, "It's a real shame," Ash goes from having no part of Brock's left sleeve to the right part of Ash's right sleeve to having part of it. Also, he goes being in front of and to the side of Misty to being only to the side of her. (00:05:20)
Here Comes the Squirtle Squad - S1-E12
Continuity mistake: When showing the inside of the store for the first time on the next day, there is no window two planks away from the left of the door, but in the next shot, there is. (00:13:50)
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.