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Poison
I've read many old threads here and on reddit, where many people said that poison is easily countered by water.
Water has no type advantage over poison in any way. Did water have any advantage over poison last time?
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https://web.archive.org/web/20161206031927/https://pokemongo.gamepress.gg/pokemon/134
With the old damage calculations where STAB and weakness were both at x1.25, Vaporeon was a good tanky counter to anything that didn't resist it and deal super effective back.
And that is not even going back to last summer when Water Gun had base damage 10 with .5s duration.