That would be your trainer ID. Each time you start a new game, the game automatically generates a 5 digit number that is marked as your "trainer ID". Trainer IDs are useful when trying to tell the difference between players that have the same character name.
Pokemon: HeartGold (USA) Game ID: IPKE-4DFFBF91
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.
This is Pokemon Heart Gold's id code: IPKE-4DFFBF91North American Pokemon HeartGold Game ID IPKE-4DFFBF91European Pokemon HeartGold Game IDIPKE-AD102382
Ipke-4dffbf91
if you are talking about your Nintendo wifi id you get it when you go on wifi
Ipke-4dffbf91
Pokemon: HeartGold (USA) Game ID: IPKE-4DFFBF91
IPKE-4DFFBF91 - Soul silver
This is a common issue people have, but the game ID is IPKE-4DFFBF91.
the games name and code In Pokemon Heartgold IPKE-4DFF-BF91
Ipke-4dff-bf91
There is no best Pokemon on Pokemon HeartGold.
there is no Pokemon Mansion in Heartgold.
No, you cannot change your ID number. It is randomly chosen for you when you create a save file in the game. You have no choice in choosing or changing it.