Epidemiology is concerned with the incidence of disease in populations and does not address the question of the cause of an individual's disease. This question, sometimes referred to as specific causation, is beyond the domain of the science of epidemiology.
Ninetales is the evolved form of Vulpix, who evolves by the use of a Fire Stone, while Alolan Ninetales is evolved with an Ice Stone.
Alola Vulpix can be a reward from the Lawyer in Anthinans Park District when you beat Santa. Choose wisley because you can only do it once. Alola Vulpix can also be hatched from a white egg. This egg can be obtained from the day care by breeding or can also be traded with another person.