if you mean lunatone then you can get it in the safari zone if the right objects are placed. to find out exactly how visit the pokemon marriland or serebii safari zone guide.
at fullmoon island in the flowers
Lunatone can be caught wild in the Safari Zone.
There is no best Pokemon on Pokemon HeartGold.
there is no Pokemon Mansion in Heartgold.
They are not in Pokemon HeartGold
No. No.
where is the pokemon transfer lab in heartgold
No, but you can trade Pokemon only in HeartGold to Black
Aura Beam is in Pokemon HeartGold.
That is impossible in Pokemon HeartGold and SoulSilver.
Lunatune does not evolve.
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.