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You can choose to have a level 1 Palkia Dialga or Giritina. You take arceus to this place in heart gold soul sliver. And Cinthia will be there she will tell you how acreus can create new pokemon.
Any pokemon following you? lol I think thats going a bit far as in a goldeen needs water to move around in so its going to be only certain pokemon i think.
The new 3D look will make this one of the best games to come. With diamond and pearl it looked cool but sinoh was new to us. Because there re-vamping gold and silver it will look 10x better than D/P/P.