I have neeveeerr been a fan of Christmas stories/movies/etc. XD Also not a huge fan of pokemon versions of already exiting tales. I'd rather make up my own in the style of a folklore, like this ancient thread.

So yeah if this was a thing, I'd say that it sholdn't be restricted to Christmas/holiday related stuff, nor should each story need to be renditions of already-existing tales. Instead I think "Heartwarming Pokemon Folktale" styled stories would be best. :] With, of course, the option to make it holiday related or a rendition of an already existing folktale. I'd totally participate were this the case. :3