You can obtain it only in Halloween events or some old events. Even if you didnt download castle and late to get the palettes then you will no longer get the palettes.

It's okay, don't cry. I'll call to help them and give with palletes!

Sorry, I'm can't, ima just a Derp Scout. 🙂🙂🙂🙂

Sorry to tell you, but that pallette can only be obtained in closed event..

Lazy_boy_ and Neru-*