I picked this from the patch just now and it's currently going for nearly 40 mil sP in shops, and has a special use: "Squash the pumpkin!"

What does this do? SubetaLodge's notes just said it's a 2010 patch item but doesn't detail what it does.

You unlock the challenger Rictus with it

It unlocks the Secret Battle Challenger, Rictus It got expensive because it hasn't been available from the patch in a long time. Really glad they put it back in this year!

Ah, I wondered if it had to do with a secret challenger! Thank you.

Oh, people are going to be happy to see that back again. Smashing it unlocks the battle challenger Rictus.

Edit: Ah, Laurey beat me to it as I looked up what challenger it unlocked, I couldn't remember. :D