WITHOUT poke bank OR internet. I'm going to replay Xy. Or trading
It depends on what game Palkia is in to begin with. If it is in a gen 3-5 game you need Pokebank, as simple as that. If it is in XY you can trade it via normal trade, as long as you have two 3DS machines. Using Pokebank/Internet trade you can get by with only a single 3DS.