If you use a Flame Orb on Milotic (inadvisable, obviously), would Rest+Sleep Talk even be necessary? The whole point of that set is to use Rest as both recovery and to activate Marvel Scale. If FO does the latter, I would much rather use Recover for the instant heal and lack of being a sitting duck otherwise.
Milotic's Dragon Tail is laughably weak, though, so it obviously is less effective against Sub users. Having something to help with this helps make the RestTalk set less of a liability, because Milotic can really shine if given the chance.
In-Game Name: Anthony
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I use legal hacks.