Shiny starter sprite

[Steelman2004]

Unfortunately no. It won’t appear as a Shiny in the Overworld until after the Damien battle. At least, according to this post:

Shiny starter hunting

The overworld sprites will appear as non shiny pokemon, you will have to go into battle if is not a shiny pokemon softreset until its a shiny. Once you catch the pokemon as a shiny its overworld sprite will appear as shiny. If you want to see a video about it search " adrive pokemon insurgence shiny"