The seasons change by the moths. So after a month of winter, it will become spring. Also you can change these in the DS menu where it has the months saved on it. Just change the month and the next time you go on to the game, it will still be winter. To change this just go into a builiding and come back out then the season will change.
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In the middle of Twist Mountain when it's winter.
route 13, Twist mountain, only in winter
Spheal can be found in Undella Bay while surfing during the winter.
No, there are no legendary Pokemon there, just a rare item.
Tuesdays, in Spring, Summer and Autumn. They do not sell cones in Winter.