How do you get paltipane in Lego star wars III

Make all the planets Republic-controlled. Winning all the Republic missions isn't necessary; just make sure all the planets are highlighted blue. Or you can enter in a cheat code. But be aware that the cheat code for Palpatine is also exactly the same for the character Dr. Boll from "The Zillo Beast." If you want to use the code for Palpatine, be sure that you have purchased Dr. Boll first before entering the code. If you entered in the code and it unlocked Dr. Boll, you cannot use the code again and then you'd have to get Palpatine "the hard way." But however you choose to get him is up to you. Palpatine's character in this game is a Gunner