Name: Korean name for Arceus
OT: A Korean player
ID No.: 12235
A fateful encounter seems to have led it across space and time from the Hoenn region.
According to Serebii, your Arceus isn't supposed to be shiny, meaning it's illegal.
Just scroll down until you see the first "South Korea" and then find your Arceus. There has only been one shiny Arceus event for Japan, not Korea.