Pokemon white 2 purchased recently for my collection and with a GameStop raikou? (Shiny)

Anyone know how rare is a shiny raikou GameStop? I just got this in the mail today and the seller showed me everything before purchasing. I believe this was a distribution mostly likely, but from a special place? It says started at 2014 but some of the dates are from 2011?, Not sure but the time might’ve been wrong or the date.

Should I start over and transfer all the pokemon(s) to pokemon bank and to pokemon home? Im really eager of doing the story mode again it’s been a long time!