I've never understood this logic. Unless you've already trained it to 100, what is stopping you from breeding another one? It literally takes like 10 minutes from the time you leave the parents at the day care to the time you hatch the egg. It takes like, a day or so if you IV breed, and that assumes only moderate luck.
Well, I've done just that, she's level 94 ^^; She's also shiny, so that adds to why I wanna keep her.