Pokemon Pumpkin

A pumpkin carved into a jack-o'-lantern for Halloween
Pumpkins are commonly carved into decorative lanterns called jack-o'-lanterns for the Halloween season in North America. Throughout Britain and Ireland, there is a long tradition carving lanterns from vegetables, particularly the turnip, mangelwurzel, or swede. Not until 1837, however, does jack-o'-lantern appear as a term for a carved vegetable lantern, and the carved lantern does not become associated specifically with Halloween until 1866. Significantly, both occurred not in Britain or Ireland—but in North America. Historian David J. Skal writes,
Although every modern chronicle the holiday repeats the claim that vegetable lanterns were a time-honored component Halloween celebrations in the British Isles, none gives any primary documentation. In fact, none the major nineteenth-century chronicles British holidays and folk customs make any mention whatsoever carved lanterns in connection with Halloween. Neither do any the standard works the early twentieth century.
In the United States, the carved pumpkin was first associated with the harvest season in general, long before it became an emblem Halloween.