Seasons in the game change every real world month: Spring during January, May, and September; Summer during February, June and October; Autumn during March, July, and November; and Winter in April, August, and December. Outside visual appearance and changes in music, seasons can also change parts of gameplay.
Several locations in the game change depending on the season. These include Route 8, Dragonspiral, Undella Bay, and Moor of Icirrus. The season in these locations can effect which wild Pokemon appear. Seasons also have an effect on some Pokemons abilities, such as Sawsbuck and Deerling.