After you get the Pokemon, check it's summary and you'll know. And SRing for a shiny starter on Crystal would be the same as doing it on GS. Personally, I don't think it takes that long, but HGSS is probably the fastest of all main games to SRing for a shiny starter, because you can look at all three of the starters beforehand and see if any of them are shiny. Please use the Q&A thread next time, thanks!