The Mandarin Island Miss-match - S2-E18
Character mistake: Prima tells Jynx to use Ice Beam, but she very obviously uses Ice Punch. [This is actually a result of mistranslation. In the Japanese version she orders Jynx to use Ice Punch.]. (00:18:50)
The Mandarin Island Miss-match - S2-E18
Revealing mistake: When Prima walks over to Ash and his friends, she is briefly layered between the table and Tracey. (00:03:06)
The Mandarin Island Miss-match - S2-E18
Continuity mistake: When Ash wins the match in the beginning, Tracey's orange bag turns green like Ash's. (00:01:12)
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.