Well If you want to be really hard to take down and to annoy the hell out of your opponent, you could go with Rest, Sleep talk, Surf, Recover. I ran this kind of a Vaporeon on a Toxic stall team a while back and it does pretty decent. Otherwise you can always give Milotic something like Flame Orb as an hold item. It will activate Marvel Scale, It will protect Milotic from other status and it screws over Trick users.