defending pokemon spammin ice shard does more dmg than spamming icy wind, so yes, icy wind sucks.
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I evolved the only 100% I've ever caught in the wild and got that moveset :(
My tears were big as Jigglypuffs
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Horrible on attack. No point in powering up a dewgong anyways so IVs are not as relevant. Its serviceable tho for training although I prefer a tentacruel with non-Stab blizzard over a dewgong with IS/IW.