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.
u have to beat team rocket in goldenrod city radio tower and go through the ice cave and you will end up in blackthorn city, where the last gym is
go to the viridian city
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
What? The under is only found in Pokemon Colosseum? Can you say what city it is in heartgold.
From mahogany city go up to the ice path and cross it.At the end is blackthorn city.
There is no saffron city.
in polysyllabic city
In veridian city
Cianwood City
In Goldenrod city
It is in blackthorn city
The Lighthouse is in Olivine City.
in goldenrod city
in blackthorn city