I'm trying to get a Sylveon and I just caught a Lvl. 20 Eevee with a good nature and a fairy attack. If I evolve it now, will it have the same stats as if I hatched the same Eevee and evolved it at Lvl. 2?
In other words: Will Sylveon retroactively gain the stats (especially the higher Sp.Atk) it basically lost due to these 20 levels as Eevee?

>inb4 Google it!
I did, but I couldn't find a clear answer...