You need to go to a Nintendo event for acreus, but it's much easier to buy an action replay for $20 and hack to get him (use this wisely). Also you will need to go on Google or another search engine and type in action replay code for azure Flute or arcues, and usually you can find the right code without to much trouble.
This is how get an action replay and do cheats
you need an azure flute
Aura Beam is in Pokemon HeartGold.
That is impossible in Pokemon HeartGold and SoulSilver.
No, you cannot sell eggs in Pokemon HeartGold.
You need to mate the Pokemon with a Ditto.
yes at supercheats.com/pokemon heartgold action replay codes
You can't.
action replay
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
If they where traded to you the game is not glitch'd
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.
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.