use the rainbow pass, and go to seventh island, and talk to Sal in the pokecenter, he will lead you there.
It's on New Moon Island
New moon island is only avalible in Pokemon pearl, diamond and platinum
head east from full moon island to get to new moon island
You have to have the member's pass. You go in, and you fall asleep, waking up on New Moon Island, where you can catch Darkrai.
You catch Cresselia
The lakes, Spring Path, Stark Mountain, Full Moon Island, New Moon Island, etc.
Darkri is on new moon island, you can get there by cheating or a Nintendo special event.
Half Moon Island does not exist in Pokemon Diamond, Pearl, or Platinum (or any Pokemon game). The only two islands named after moon phases are Full Moon Island and New Moon Island, and the closest place to either of these two islands is Iron Island.
Yes there is new moon island, hall of origin.
Cresselia's island and Darkrai's island.
By no legal means can you access New Moon Island in any game other than Diamond, Pearl, or Platinum.
you can get Cresselia at full moon island Darkrie at new moon island diagla at spear pillar for diamond and palkia at spear pillar for pearl