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I decided to MM for a Corphish about an hour ago, and got this on the seventh egg of actual MMing after breeding for IVs and moves.
Third shiny this week in a dream ball. First was a Wailmer that hatched while I was still IV breeding without a foreign parent and it happened to be the first with all the right IVs. Second was a Spinarak that also hatched on the seventh egg after IV & move breeding.
Dream balls seem extra lucky this week.