To unlock Sunyshore City in Pokémon Pearl and Diamond you have to beat Team Galactic. They can be found at Mt. Coronet.
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The Underground or Sunyshore City
sunyshore
=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.=
HM07 is waterfall and you get it by talking to the girl that's at the north part in sunyshore city on the sand.Her name is jasmine and she gives you waterfall but to use it you need to beat the electric gym in sunyshore city.
the very first swimmer at the top of sunyshore city before you get to the elite 4 has one