=you have to of done all seven badges to get there. You shold be able to after then. By the way the 8th gym is in sunyshore city.=
The Underground or Sunyshore City
beat snowpoint city gym then get palkia if you have Pokemon pearl or go and get dialga if you have Pokemon dimond then try again then you should be able to get there.
sunyshore
To unlock Sunyshore City in Pokémon Pearl and Diamond you have to beat Team Galactic. They can be found at Mt. Coronet.
If you're talking about the guy blocking the path to Sunyshore city in diamond and pearl, you have to defeat Team Galactica at the top of the mountain, beat palkia, etc. After that the guy is gone.
You cant
Between Sunyshore City and Route 223.
you need to have cought giratina from the distration world of course it is just like diamond and pearl.
The Underground, and Sunyshore City
The Underground or Sunyshore City
beat snowpoint city gym then get palkia if you have Pokemon pearl or go and get dialga if you have Pokemon dimond then try again then you should be able to get there.
you need to capture/kill palkia/dialga at mt cornet and go to team galactic base in veilstone city
sunyshore
The last Gym is in Sunyshore City.
In sunyshore city. I don't no where in sunyshore.
Sunyshore City
Very north of sunyshore city.