BW056: The Four Seasons of Sawsbuck!

Episode Plot
Along the way to Driftveil City, Ash and co. encounter a Deerling. However, this Deerling was different from the ones Ash had seen so far, as it was green instead of pink. Cilan then explained that as the seasons change, so does Deerling's color, indicating the season has changed from Spring to Summer. Ash wasn't the only one interested as they meet a photographer named Robert who wanted to see a sight no one has ever seen. No one that is except his grandfather: All four forms of Sawsbuck in the same place at the same time. Can Ash and friends be able to help him?

Pokemon Debuts

 * Deerling (Summer Form)
 * Sawsbuck (Summer Form)
 * Sawsbuck (Autumn Form)
 * Sawsbuck (Winter Form)
 * Amoongus

Trivia

 * Since the Deerling was in Summer Form it can be assumed that the season has changed from Spring to Summer since Ash's journey in Unova began.
 * Even though they're in photos this is the first time, in the entire 14th season, we see Pokemon from regions (except from Johto), other than Unova.