You don't you have to migrate to get sinnoh pokemon.
To get to the sinjoh ruins you need an arceaus from the 2009 events as the first Pokemon in your party then you go to the ruins of alph. then you go to the house in it. a guy will run into you and start talking about arceaus he will take you under ground and you will all of a sudden vanish and be in the sinjoh ruins.
If you have a fateful encounter arcreus you can get either dialga palkia or giritina lv. 1 at a place called sinjoh ruins. I'm not sure where sinjoh ruins are, but I know of a website that has everything Pokemon and it's called Bulbapedia, so you should check it out.
you have to get arceus from pokemon diamond/pearl and trade it to your heartgold/soulsilver.After you got arceus go to the house in ruins of alph then you will go to the ruins then a light comes out you will go to an old cave then you will see champion cynthia and talk to her than you will go to sinjoh ruins
You do not need the National Dex in order to get into the Sinjoh Ruins with an Arceus, all you need is the Arceus and to approach the research building in the Ruins of Alph area with Arceus walking behind you and the researcher will take notice of you and your Arceus and he'll take you inside the Ruins of Alph which is where you'll then be transported to the Sinjoh Ruins.
It has always been level 1 for every Pokemon Platinum game. Similarly, Pokemon SoulSilver and HeartGold has a location called Sinjoh Ruins, which contains Giratina, Dialga, and Palkia at level 1.++
take a aceous that had a fateful encounter to the building that does ont lead underground at the ruins of alph you will be transported to the sinjoh ruins. go out side and follow the hiker . when you get to the house talk to Cynthia then deposit all of your Pokemon accept aceous in the PC then go back to the sinjoh ruins and pick giratina. the giratiana is holding a glistous orb
There is no best Pokemon on Pokemon HeartGold.
there is no Pokemon Mansion in Heartgold.
when you get arceus go to the ruins of alph house and you will bump into the owner he will tell you somthing then there is a cutscene and you will be teleported thereFirst, you need to have an Arceus. Put it in the first ("walking") slot of your party and go to the Ruins of Alph. If you walk outside the small building, a man will walk out, talk to you and then head off into the ruins. Follow him there and you can eventually get into the Sinjoh ruins.
They are not in Pokemon HeartGold
You can get a level 1 Palkia, Dialga or Giratina in HeartGold or SoulSilver versions if you have an Arceus in your party. Enter the lone building at the Ruins of Alphs and an event will start where you get taken to Sinjoh Ruins. Talk to Cynthia where she will give you a choice between one of the three legendary pokémon from Diamond, Pearl and Platinum versions.
where is the pokemon transfer lab in heartgold