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Guys, "nymph" in Japanese is "ninfu". The Japanese name for Sylveon is Ninfia. Ninfu = Ninfia. It's not difficult.
Plus if you just simply googled Nymph and went to Wikipedia it says that nymphs are FEMALE nature and have 5 types of water, land, plant, underworld, and celestial. Does that preview from the trailer not make Sylveon look celestial?