Goodbye Chicorita!? The Electric Labyrinth! - S4-E42
Character mistake: At the end of the episode, the narrator says that Ash and his friends will continue on their journey to Johto. However, they are already in Johto. (00:20:35)
Dig Here Urimoo! Search for the Hot Spring!! - S4-E31
Character mistake: When Misty asks if the Swinub help with finding hot springs, she refers to them as "Swinubs." The plural of a specific species of Pokémon is the same as the singular. (00:03:53)
Character mistake: At the beginning of the episode, the narrator says that Ash and his friends are heading to Johto. However, they are already in Johto. (00:00:05)
Flap, Yanyanma! Fly to Tomorrow's Sky!! - S4-E20
Character mistake: At the beginning of the episode, the narrator says that Ash and his friends are heading to Johto. However, they are already in Johto. (00:00:07)
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.