SushiFlavouredNoodles

Yes; starter Pokemon have the same chances of being shiny as other Pokemon (which in Spork is raised to the same chance as Reborn and Rejuvenation). 

(also, the best place to ask questions about Spork is in the thread itself, since I keep up with it regularly and get a notification every time someone posts there, whereas I don't always check the status bar and might not see statuses or other places)