That's okay, nobody else here had seen one before, either. I'm from Rhyme City, which is in the Kanto Region, but I don't expect you to know that, either.
Don't know what cocoa puffs are, but Poke Puffs have cocoa in it! Mocha, to be exact! It's like.. a malasada? Or a donut. But not really. More like a pastry, with mocha cream filling and icing on top!