Breed a Pokemon from your game from one from a different country (like Japan). The egg ill be about three times as likely to be shiny then just looking for one in the wild.
you don't
You can't, trade with soulsilver
to find Blue in HeartGold or SoulSilver go to Cinabar Island next to Seafoam Island and go right next to the Pokemon center.
You can only find Skarmory in the Pokemon SoulSilver version.
You'll need to trade for it, because evolving Feebas will be impossible in Pokemon HeartGold and SoulSilver.
you don't
Somehow
You can't, trade with soulsilver
Groudon is unavailible in Pokemon heartgold trade from soulsilver to get groudon.
No, you can not get registeel in HeartGold or SoulSilver. The only way to get it, is by trading
you can find Bill in heartgold and soulsilver, but he will only tell you how much space you have left in your PC Box(he's in Goldenrod city
to find Blue in HeartGold or SoulSilver go to Cinabar Island next to Seafoam Island and go right next to the Pokemon center.
No Yes and you can find action replay codes for the action replay for heartgold ans soulsilver all over the internet.
Ledyba is in SoulSilver only
Inside mt motar
You can't. SoulSilver Only, unfortunately.
You cannot find Deoxys in HeartGold, or SoulSilver. You can only get Deoxys through trading or at a Pokemon Event.