What happens in episode 357 of Pokemon?

Episode 357 of the Pokemon anime is titled "The Champ, The Charm and The Chosen!" and it was first broadcast in Japan on March 23, 2017. The episode features the following events:

- Ash and his friends arrive in the Sinnoh region and meet up with Dawn and her friends.

- Ash and Dawn decide to participate in the Wallace Cup, a Pokémon competition held by the Sinnoh Champion, Wallace.

- Ash and Dawn win their first round matches and advance to the next round.

- Ash and Dawn meet up with their rivals, Paul and Zoey, and learn that they will be facing each other in the next round.

- Ash and Dawn battle against Paul and Zoey in the next round and both manage to win their battles.

- Ash and Dawn advance to the finals of the Wallace Cup and will face each other in a final battle to determine the winner.