Let us say that I luckily got a shiny! when I saw it again (in the part where you get all the starters and there mega's) would it still be shiny?
Probably YES
Still now nobody got shiny Glalie/ Steelix.The reason why I am saying because when you nickname Glalie/ Steelix,the nickname remains the same when we get all the starters.If nickname remains the same why not shiny.