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For those who say that HeartGold / Soul Silver has a terrible level curve, Sacred Gold / Storm Silver not only corrects this but also makes the game much more challenging. (Trainers have better/ higher level Pokemon, ALL gym leaders now use 6 Pokemon and these have better movesets, etc) The game also allows you to capture most of the 493 pokemons from IV gen even before elite 4, adding special events to capture the legendaries in the post game.
In addition, pokemons that previously only evolve through trads now have in-game methods to evolve.
This romhack has several other perks, I advise you to look better. All I can say is that it is very worthwhile.
