Most Hoenn pokemon(Ruby,sapphire,emerald)and most sinnoh(diamond&pearl)pokemon arent on HGSS
A small handful of Pokemon from Hoenn and Sinnoh regions are found wild in the game, excluding Pokemon from earlier generations that have new generation evolvements.
Pokemon that are only found wild in Soul Silver that cannot be found in Heart Gold are: Vulpix, Ninetails, Meowth, Persian, Kabuto, Kabutops, Ledyba, Ledian, Delibird, Skarmory, Teddiursa, Ursaring, Mawile, Gulpin, Swalot, Lileep, Cradily, and Groudon.
I suggest going to Bulbapedia or Serebii.net for verification and any I may have missed.
The only Pokemon you can't get in heartgold is Unpva Pokemon!
There is no best Pokemon on Pokemon HeartGold.
there is no Pokemon Mansion in Heartgold.
They are not in Pokemon HeartGold
where is the pokemon transfer lab in heartgold
No, but you can trade Pokemon only in HeartGold to Black
That is impossible in Pokemon HeartGold and SoulSilver.
Aura Beam is in Pokemon HeartGold.
No, there are no underwater routes in Pokemon HeartGold or SoulSilver. The HM Dive is not available in Pokemon HeartGold or SoulSilver.
Technically,yes you can get Arceus in Pokemon Heartgold,but only by trading it to your Pokemon Heartgold game from Pokemon diamond,pearl or platinum.
no, but use can use poketransfer from heartgold to white
Pokemon HeartGold can communicate with all the DS Pokemon games. :c)
there are many legendary Pokemon in Pokemon heartgold, but the best is HO-OH