I think you might need Vivillon to evolve Eevee into Sylveon. Look at Vivillon's inner wing color scheme compared to Sylveon's ribbon color scheme. The method would probably be like Mantyke & Remoraid or even worse: Karrablast & Shelmet.
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i don't think so, personally. vivillon is a fuchsia colour with some black - kinda reminds me of those girly goth things. sylveon is just your typical light pink... thinger. they also don't really seem to be connected - remoraid is on the wing of a mantine, so it makes sense in that regard. shelmet and karrablast are also supposed to be rivals of each other, which is why they evolve.