Episode 42 can be read here.
It’s time for Ash to try to earn his third Tenno Gym Badge in a battle against the Starcore Gym Leader, Neutrina. Ash thinks he’s ready, but Neutrina has him second-guessing himself as she uses strategy after strategy to wear Ash’s Pokémon down.
Also, the Pokédex and Attackdex have been updated with the contents of the episode.