Title: Re: XY 89: イーブイはひとみしり!?お花畑でつかまえて!!/Eievui wa hitomishiri! ? ...
I think it's likely that Serena's Eievui will evolve into Nymphia, given that it's a way to show it off in the anime, but also because Sana seemed to talk about it a little more than the other evolution's.