On a Wingull and a Prayer - S6-E18
Revealing mistake: At the beginning of the episode, when Pikachu speaks, his mouth duplicates. (00:00:05)
On a Wingull and a Prayer - S6-E18
Continuity mistake: When the Team Aqua Grunt says that he will stop hurting Peeko if Mr. Briney gives him his boat, his glove disappears. (00:09:31)
On a Wingull and a Prayer - S6-E18
Other mistake: When Crawdaunt first appears, the bottom of its claws are mistakenly coloured red instead of cream. (00:09:25)
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.