Mentioned by AmourShipper_

So this is the scan that states that Serena's Eevee will evolve into a Sylveon.

Honestly, Espeon and Sylveon were the top two contenders as to who would Eevee would evolve into.

The stone Eeveelutions just don't feel right because who knows where the gang is going to get an evolutionary stone. Unless they go to the Lumiouse stone shop for that sole purpose, but that's unlikely.

Leafeon and Glaceon could have happened, but they are past the Icy Rock, and Mossy Rock is in the Pokemon Forest, and they won't reach there probably until the end of XY and Z.

Umbreon is sort of unlikely, unless Serena and Eevee are practicing late at night for the next Tripokalon and it evolves then, but we know that it will be Eevee when the fourth Tripokalon comes around. Maybe later in the Master Class performances it could happen, but who knows.

Espeon is likely because Serena and Eevee would most likely be practicing a performance in the day, or performing on stage in the daytime. An onstage evolution would be cool, too.

Sylveon is most likely because it evolves similar to Espeon and Umbreon; by friendship, but, in the games, via Pokemon Amie (or I think that's what it is). And Pokepuffs increase the friendship value (the hearts) of that Pokémon. Since Serena often bakes Pokepuffs for the Pokemon, it makes some sense.

But the anime hardly goes by the game mechanics, so everything I just said could be wrong, except maybe Umbreon and Espeon.

But, yeah. Main point, most likely, Serena's Eevee will be a Sylveon, what with it being a signature Fairy-type in Kalos.

And that explanation was really long and unnecessary.

And Bonnie's face looks like a Zygarde Core.

(Was Bonnie's Japanese name always spelled "Yurieka", and not "Eureka"? That's one thing that is making me believe this is fake...)