Ok, here's a PM I just sent on how to do it so I'll paste it here.
First of all, you need to go to Kaina City. It's the city South of the bicycle one. There, go to the beauty contest and inside, talk to the little girl on the left. She'll give you the Porok Case. Then, go over to the table where an old man and young boy sits. Stand at the top and press A while faciing the table. Choose yes (the first option) twice and your bag will open up with your list of Poroks. Choose whichever one you'd like and then you'll see it fall into the blender along with the old man and boys. Now, the key here is to press "A" whenever the pointer faces yours (your pointer is the top right-hand one). Double circles means spot on, one circle means good and a cross means, well, bad. When the blender is full, you'll get a Porok cube. It'll ask you if you want to do it again. Press "A" for yes or "B" for no. Now to feed your Pokemon the Porok you need to go into your special item section of your bag and choose the Porokku Keesu (provided you can read Japanese. If not, see picture, it's the first choice.). Then choose your Pokemon and your set!
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