Oh! Yes, of course, I apologize...well, it is a matter of ancient legend! They say that the hero, along with his ten Pokemon companions, traveled to the edges of the world to do battle with the almighty Sinnoh itself! In so doing, he proved the strength of humanity, and Sinnoh blessed the Pokemon and their descendants, charging them with protecting the people of Hisui. Both of our Clans are descended from the hero, or so it is said.

[It's maybe slightly more complicated than that but Ingo is not versed in the ancient history of the Celestica or whatever!]