Gen 2 is far, far off so no need to save candies (unless your region is low on Eevees), but a Vaporeon is pretty poor at defending, even with Water Pulse; which is its best defensive moveset. I'd suggest just let it be and power up an Attacking vaporeon whenever you get a good one instead.
Edit: I'm meaning poor at defending compared to other Pokemon
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Will I power up my 97.7iv vaporeon for def purposes??
I have tons of vaporeons but this one is special coz of its near iv perfection.. 15/14/15 the only problem with this is its a water gun / water pulse skillset.. would have been better if its my attacker because of the meta of the game which they counter vaporeons right on the get go.. he is like 1.9k cp.. or will I save up the candies for gen 2??
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If you take a look at the Gym Defenders Tier List, you'll see that Vaporeon is actually one of the best defenders. And if you look at Vaporeon's page, you'll see that Water Pulse is actually the best defensive move.
I heard someone once make the argument that dust should be spent on defenders, not attackers, because defending is so much more difficult. So if you actually care about holding gyms for more than 24 hours, spending dust to power up an ideal defensive Vaporeon is a very good idea.
