nintendo

As revealed by Cynthia and a Hiker in the cabin, the Sinjoh Ruins are the remains of a temple created hundreds of years ago by two groups of humans: one who had come from Sinnoh, and another who had hailed from Johto, or specifically the Ruins of Alph. Because of this, the ruins contain elements of both the Spear Pillar and the Ruins of Alph, as a sign of the blending of the two cultures. It is unknown what brought the two clans together to build a temple for Arceus, but this probably has to do with the underlying relationship between it and the Unown.