How can you get all 3 main Pokemon on heartgold?

Answer 1

You cannot get all 3 main unless you use the GTS and trade. But you can get a started from Konto, Hoenn, too. You first need to beat Red, go to silph co. and talk to steven (a guy with blue hair on the far right side of the 1st floor) to obtain a Hoenn starter. Then by talking to Professor Oak, you can get a Kanto starter. Remember, you HAVE to beat Red first. If you don't know where he is, he is on Mt. Silver at the peak. His Pokemon are at least level 80. He has (in order) Pikachu lvl. 88, Venasaur lvl. 84, Charizard lvl. 84, Blastoise lvl. 84, Lapras. lvl 80, and Snorlax lvl 82.