A mass outbreak in Pokemon Black and White is when a certain species of Pokemon becomes available temporarily that would not normally be there. Most of these are for the older Pokemon, and only after the National Pokedex is received.
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Every day there is a different spot the outbreak happens. If you do not like the outbreak restart the game.
there has to be a pokemon outbreak for it to work, s/he is in route 2
The 'mass outbreak' is a swarm of Pokemon that you would not normally find anywhere else, and are at extremely high frequency rates. You can listen to Professor Oak's talk show for what the mass outbreak of Pokemon is and on what route it is on.
the places vary. check the radio to find out which Pokemon is appearing where.
mass outbreaks are according to day, not time. So there is a different mass outbreak every day.