The last city in the Johto region is Blackthorn City. To get there, you must travel east from Mahogany Town. From there, you will see a cave (The Ice Path) in which you must go through to get there.
one berry
No, there are no underwater routes in Pokemon HeartGold or SoulSilver. The HM Dive is not available in Pokemon HeartGold or SoulSilver.
Get a old amber and take it to a guy in the museum in Petwer City,
Fight the remaining 8 gym leaders.
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
In the first city
From mahogany city go up to the ice path and cross it.At the end is blackthorn city.
What? The under is only found in Pokemon Colosseum? Can you say what city it is in heartgold.
There is no saffron city.
In veridian city
in polysyllabic city
It is in blackthorn city
Cianwood City
In Goldenrod city
in blackthorn city
The Lighthouse is in Olivine City.
in goldenrod city