There is not a weather institute in Pokemon Heartgold, you are thinking of Pokemon ruby, sapphire, and emerald, there is not a weather institute in Pokemon heartgold.
Beat the Pokemon league
the wheather institute doesn't exists in Firered... Only on Ruby, Sapphire & Emerald
Pokemon black and white :D
no, you can't
It depends if you like the original Pokemon or the all-new Pokemon but ss and hg have more Pokemon but b/w only have 152 Pokemon, i am glad to help
You can't find registeel in Pokemon HeartGold.
You can't go to Hoenn in Pokemon HG/SS.
You may only clone Pokemon in Emerald, but you may own as may of the same Pokemon as you can (bearing storage space in mind). Therefore, you cannot clone Pokemon on "Pokemon Heartgold" (HG) or "Pokemon Soul Silver" (SS).
You cannot trade a Pokemon from the 5th generation to the 4th generation or below. Getting Pokemon from Black/White to HG/SS is impossible. You can migrate Pokemon from HG/SS to Black/White though.
it's a Pokemon game Heart Gold
no he does not evolve in Pokemon hg or ss
Battle Frontier.