It is not pyramid island it is the Isle of Ruins. There are three pyramids there. There is a a precious metal there needed to make the Phantom sword. The island is in the Northeast region of the sea chart. You can only access the island (which is blocked by a cyclone) after getting the necklace on the Isle of the Dead first. Both islands sit across from each other, west and east respectively.
Hope this answers your question.
Chillyn815
the hammer is in the island that is in the 4th sea chart in the pyramid island.
The 4rth sea chart
In Link and the legend of Zelda, Phantom Hourglass, you get the hammer in the isle of ruins, or the island of the dead.
beat the pyramid temple
yftyffgfdcrdrx
Molaida Island
isle of ruins in the king's pyramid
On Molida Island.
it is on eddo's island
no its not its on windwaker
On the island of ruins
(it is located at molida island)