The best replacement for sylveon is florges.

The best alternatives to sylveon are rated as following:
★★★★★  florges
★★★★  froakie
★★★  clefable
★★★  xerneas
★★★  vaporeon
★★  gardevoir
★★  espeon
★★  azumarill
★★  klefki
★★  togekiss
★★  jolteon
★  umbreon
★  goodra
★  blissey
★  mawile

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Speaking about sylveon, one probably shouldn't forget about hyper voice.

Other search terms related to sylveon and their ratings are:
★★★★★ hyper voice
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Google Trends

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sylveon
florges
froakie