Lizardon Valley! Until We Meet Again!! - S3-E18
Character mistake: When displaying the title card in the English dub, it says "Charizard's Burning Ambitions," but the voiceover incorrectly says it as "Charizard's Burning Ambition." (00:02:21)
Lizardon Valley! Until We Meet Again!! - S3-E18
Continuity mistake: When Liza says, "Your Charizard could use some training!" Pikachu's ears are raised, but in the next shot, they are lowered. (00:09:57)
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.