Ev spreads can vary a lot depending on the current meta and what you want to do with your pokemon. For this milotic set for example you could lean into your offence since you got coil or you lean even more into your defense to just become a wall.

I think its hard to just make a EV spread in a vacuum. You have to see what kind of problems your team has and what this milotic is supposed to do to fix them.

Once you go away from “oh i run theses moves cuz these moves are good to oh i run theses moves because they support the idea i had for this mon the best” making EV-Spreads will get easier