Eevee's Eighth Evolution, Sylveon, Is the Newest Pokémon Announced for “Pokémon X” and “Pokémon Y”!, Game News

Pokémon X and Pokémon Y are planned to release simultaneously worldwide this October.

Pokemon Go Eevee Evolutions Guide: How To Evolve Eevee Into Espeon, Sylveon, Vaporeon, And More - GameSpot

Xerneas Coming To Pokemon GO May 4th 2021 – NintendoSoup

SGGAMINGINFO » With a new Pokémon series a new Eevee evolution appears

Pokemon GO reveals Luminous Legends Y event, debut of Yveltal

Pokémon X and Y - The Cutting Room Floor

Pokémon X and Pokémon Y, Pokémon Wiki

Pokémon X & Y - Fairy-type

Bonus PokéWalls

Pokémon X & Y: Fairy-type Confirmed: Sylveon, Marill, Gardevoir, and Jigglypuff!

A New Evolution of Eevee Announced for Pokémon X and Y - News - Nintendo World Report

Brand-New Pokémon Type Confirmed? - My Nintendo News