It happens sometimes.... they won't always follow thatMinccino is unaffected by Night Shade, a Ghost-type move, and Yamask is unaffected by Swift, a Normal-type move. Why did they receive their respective damage?
It's just his hero instinct telling him that taking all the wild pokemon isn't right...or something.I don't think they were doing anything wrong. I also can't stand Ash's need to stop them from capturing WILD Pokemon. Although they should just use PokeBalls.