Thank you for making good, well thought out posts. It's kind of sad to see so few intelligent people posting in the suspect threads. This might not matter much coming from me or anything other nobody, but it is appreciated, so thanks.
The EVs didn't actually have a purpose outside of balance. I hit an HP number divisible by 8 for the recovery, I got my SpD above 220, and then the rest was put into Df and At. Not exactly much method to the madness lol but I can't say I've been disappointed with it yet. Speed rarely is an issue when you're as bulky as that.
And interestingly enough I recently changes them in my thread. The SpD EVs really weren't doing me much good so I dumped the rest into the other three stats. The spread is now Impish 180 HP / 196 At / 132 Df
Sleep wasn't nerfed, it actually got better, I meant that ResTalk was nerfed. Because the sleep counter now resets with each switch-in, Milotic may not get the chance to wake up again, and thus would be unable to Rest again to restore its health.
Both have their uses, depends on what you need. Boiling Water may occasionally conflict with Toxic and vice-versa, though, so I'd go with Dragon Tail.
I was partial to the ResTalk set we were all talking about in Milotic's thread, but the nerf that sleep has been given means that you might be able to heal back to full health once before being killed; there's no way you can stay asleep for 3 turns AND heal up again.
So I'd probably go with Calm 240 HP / 252 Def / 16 SpD and run Boiling Water / Recover / Dragon Tail / Ice Beam or Toxic. Thunder Wave and Wow are everywhere, so it shouldn't be too hard to pick up a status. Ice Beam lets you deal with dragons and grass-types straight away, while Toxic lets you poison other bulky water types before phazing them away.