hoho at bell tower, lugia at whirl islands, entei and raikou randomly around the place (you can see them on the map), kyogre (heartgold only) with blue orb and groudon (soulsilver only) with red orb. they are both at embedded tower.
You can not.
In Pokémon HeartGold, you can find the 3rd Gym Leader in Goldenrod City.
You cannot find Deoxys in HeartGold, or SoulSilver. You can only get Deoxys through trading or at a Pokemon Event.
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
no you can't
Mt.silver
goldenrod
in safari
You cant!
trade
on the pokewalker