I was wondering, what are they used for? o_O Do they have any special meaning, or are they just rare to find? I'm a bit confused. :x

I think they are rare to find, when you smash the pumpkin it brings in a Battle Coliseum Opponent :)

This was addressed in the news. :)

You can smash one to find a hidden battle coliseum opponent. :)

you smash it and unlock rictus (a battle opponent)

Thank you everyone for the answers and for directing me to that news article. n_n Have a nice day/night!