Quoted By:
-S Tier-
Vaporeon (Both), Flareon, Eevee, Umbreon (Both)
-A Tier-
Jolteon, Espeon, Eevee (Shiny)
-B Tier-
Flareon (Shiny), Sylveon, Glaceon (Both)
-C Tier-
Leafeon (Both), Sylveon (Shiny)
-E Tier-
Jolteon (Shiny), Espeon (Shiny)
This is all based on looks alone by the way.