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Outbreak spawns are tied to whatever spawns the most nearest to you. Once those are out of the way it's what spawns the most farthest from you. If it has a higher spawn rate, it'll have more outbreaks. It's that simple.
You can easily get your desires outbreak though. It's just depending on where exactly it is, what typing it has, and what pokemon share it's habitat that bites you in the ass.
