Shepseskare is not a well-known pharaoh. Very few documents refer to him, and it is known that he only ruled for a short time between Neferirkare and Neferefre. A few seal-impressions with his name show up at Abu sir, but these are about the only attestations to his reign that have been found.

Both t he Turin canon and Manetho agree that he ruled for 7 years, which seems to be the opinion of most egyptologists (even if they can't agree on which seven years he ruled). His name is also listed in the king list at Saqqara.

There is no written evidence that he built either  a pyramid or a sun temple along with the other pharaohs of the fifth dynasty. However, an unfinished pyramid between the pyramid of Sahure and the Sun Temple of Userkaf have been credited to him based on some inscriptions.  The reference to his name was found in the mortuary temple of his successor, Neferefre.  Considering that the pharaohs of this dynasty spent most of their tie finishing or enlarging the monuments of their predecessors, he probably  just ran out of time to build his own.

The unfinished pyramid is just north of the complex of Sahure, and was discovered in the 1980s. It mostly consists of earthworks, as work was stopped as soon as Shepseskare died and his brother Neferefre took the throne. The foundation was in place, but little else. From the size of the foundations and markings, though, it was planned as the largest pyramid in he Abu Sir field.

Like his brother Neferefre, Shepseskare incorporated both his "king name" and "birth  name" into his cartouche.

pharaohs

Userkaf
Sahure
Neferirkare (Kakai)
Shepseskare
Neferefre
Niuserre
Menkauhor
Djedkare
Unas

monuments

Unfinished Pyramid,
Abu Sir