It will include all events in the previous SoulSilver and HeartGold and there will be new features added such as the pedometer (the thingy that counts your steps) which allows you to deposit one of your Pokemon onto the device. By doing this you will help level up your Pokemon every step you take. It will also let you have your Pokemon out while walking which is always a cool affect because it brings out the true meaning of the game.
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A hack of Pokemon SoulSilver that makes the game harder and adds new Pokemon not in SoulSilver, along with new game events.
lugia has not been available to players without cheating or Nintendo events until heartgold and soulsilver, where you can find him in the whirl islands after obtaining the silverwing.
Action replay or Nintendo events
Transfer it from your bottom game or get it from a Pokemon event. Pokemon events are under Wifi Conection but they don't happen often.
Through events.