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Milotic is one of my favourite Pokemon and it somehow took me a year to work out it got a second standard ability this gen. Just found that out earlier today. Suffice to say, I'm now grinding for an Ability Capsule to switch her from Marvel Scale to Competitive.
Also, unless a Pokemon is ridiculously unique (like Imposter Ditto), I can't stand using Pokemon that don't have a way to recover health. Wish, Recover, Roost, Leech Seed, Giga Drain/Drain Punch, shit like that are all fine (Rest isn't though). But if something lacks something like that I really struggle to convince myself to use it.