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When they introduce new eeveelutions, they always come in pairs of opposites. Espeon and Umbreon. Leafeon and Glaceon. I think Sylveon will be in a pair with a Dragon type. Like many have speculated, I think Fairy will be the opposite to Dragon. Sylveon wouldn't even need to be gender-based evolution if it was a fairy type. So...
Gen 6: Mystical Eeveelutions!