You'll need a Ditto and a Manaphy to get Phione. Got to the Pokemon Daycare and put Ditto and Manaphy in together. Walk or ride your bike for a couple of minutes then go talk to the Daycare Man.(Make sure you leave space in your party)He'll give you an egg containing Pione. Now all you have to do is hatch it. Go up and down on your bike for a while. Watch T.V or somthing while your doing this because it takes quite a long time. You'll have to take 9165 steps for the Pione egg to hatch. Have fun with your Pione!