Wouldn't you still see the sparkles though? Or the shiny symbol if you breed for a shiny.
Still clever though!
Also, cutieflys shiny is my favorite, I think it suits it great!
I doubt it will do the sparkle. Maybe it'll do it when the shell breaks? That would be cool.
As for hatching one, I doubt it matters. The whole point of it seems to be for a surprise in wild encounters.