Arceus

Having discovered your relationship with her children Dialga, Palkia, and Giratina. Now you walk up the floating divine steps to her chambers. This wasn't just a god of Sinnoh like the other three. Arceus was the creator of the world. When you arrive you notice Arceus has taken on a feminine appearance. "Welcome to my chambers mortal." Her voice echoed across the chambers ringing in your ears.