Mass outbreak is when a certain species of Pokemon suddenly appears in 1 place. For example, there may be a lot of wild Corsola in Rt. 230. You can only get mass outbreaks when you get the national pokedex by beating the elite 4 and seeing all 150 Sinnoh Pokemon. To see where the Pokemon are, head to Sandgem Town and then go to the house south of the Pokemon center. Talk to Dawn's little brother or sister for the location of the outbreak, which changes every day.
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route 203 (mass outbreak).
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.
mass outbreaks are according to day, not time. So there is a different mass outbreak every day.
Makuhita is in the National Pokedex, so you have to beat the Elite Four and Champion first. Then, there will usually be a mass outbreak of them on Route 225.
Talk to Dawn's sister in Sandgen Town and she will say Hurry there is a mass outbreak of Slakoth in Eterna Forest (Note:She will not always say this.) This works with Platinum ONLY after beating the game.