Other than a few exceptions such as Lanturn and Reuniclus, the stats on the cards are based on the video game
They could ban Vivi in Standard, in which case everyone who spent a lot of money on Vivi cards (currently going for like 40-55 bucks each as of this writing) would be pissed off, although Id argue that if you bought Vivi knowing what was happening you factored that in as a possibility
Your opponent certainly needs to change their gameplan if they face it
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Also, its a 5/5 so its not shy of getting into combat
Everyone loves the big-eared, super-charged Evolutions of Eevee