Sinjoh Ruins

Sinjoh Ruins is a place where you can obtain either a Dialga, Palkia, or a Giratina.

How to initiate
When first arriving, you go to the Alph Ruins with Arceus in the first party slot. You then get greeted by this man a then you go to the Sinjoh Ruins where you will find Cynthia, the Sinnoh champion. That's all I know about this article... someone wanna input more info?