If you recall, HG is a remake of gold, which at the time, Sinnoh was not created yet, so the game wouldn't be a remake if they put in a whole other reigon. so, you don't go to sinnoh in HG orSS
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you cant get to the sinnoh region in Pokemon hart gold or soul silver but you can get the starter Pokemon at slip co (i think its called) once you done all gyms and defeated red (the Pokemon with emerald version).
There is no Mt. Coronet in HeartGold as it does not take place in the Sinnoh region
You don't get Darkrai in Heart Gold. Darkrai is from the Sinnoh region, meaning he is only available in Platinum if you have the Membership Pass, which was given out during a special event.
There were hints for the new Pokemon G/S remakes Heart gold and Soul Silver Because she wanted to participate in the super contest in Sinnoh
heart gold, soul silver, and crystal(old)