What is mass outbreak?
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"Mass Outbreak" is the name given to Pokemon swarms. After obtaining the National Pokedex you can check Prof. Oak's radio show to find out what the day's Mass Outbreak is. It will be a species that is normally not found in the game (or a very rare species like Yanma) will suddenly start appearing in large numbers in a certain location. I believe that 30% of all Pokemon at the location of the outbreak will be that species.
The species will be random and change every day. It will eventually repeat.
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