The gates in Unova have a monitor inside that will alert the player where an outbreak is taking place. During winter, the monitor may occasionally not report on outbreaks, which is due to parts of Route 8, where Croagunk can be found, becoming frozen during Winter and not allowing the Pokémon to be caught there
Here is a list:
Paras Route 11 15-55 B W
056 056 Mankey Route 15 15-55 B W
083 083 Farfetch'd Route 1 15-55 B W
084 084 Doduo Route 12 15-55 B W
102 102 Exeggcute Route 18 15-55 B W
161 161 Sentret Route 7 15-55 B W
193 193 Yanma Route 14 15-55 B W
204 204 Pineco Route 16 15-55 B W
228 228 Houndour Route 9 15-55 B W
235 235 Smeargle Route 5 15-55 B W
236 236 Tyrogue Route 10 15-55 B W
261 261 Poochyena Route 9 15-55 B W
285 285 Shroomish Route 11 15-55 B W
311 311 Plusle Route 6 15-55 B W
312 312 Minun Route 6 15-55 B W
313 313 Volbeat Route 3 15-55 B W
314 314 Illumise Route 3 15-55 B W
353 353 Shuppet Route 13 15-55 B W
360 360 Wynaut Route 2 15-55 B W
449 449 Hippopotas Route 4 15-55 B W
453 453 Croagunk Route 8 15-55 B W
YANMA
You can only get to the future opelucid city if you have Pokemon black If you are wondering about the guy who talks about Pokemon with charge, he is what you must do: Trade with someone with Pokemon Black and get a Pokemon that knows charge. I recommend a Blitzle on Route 3. Bring it to him, and you get a Cell Battery. The above is still true, though.
Either in Route 13 or Route 17.
on route 4!
not, you have to wait until the next day to change the swarming Pokemon and its route.
Route 18. Far West of the route.
there has to be a pokemon outbreak for it to work, s/he is in route 2
sentret
Shellos cannot be found in Pokemon Black or White. You can only obtain Shellos through PokeTransfer or the Pokemon Dream World.
You can only get to the future opelucid city if you have Pokemon black If you are wondering about the guy who talks about Pokemon with charge, he is what you must do: Trade with someone with Pokemon Black and get a Pokemon that knows charge. I recommend a Blitzle on Route 3. Bring it to him, and you get a Cell Battery. The above is still true, though.
You need to watch the TV for the Route that the outbreak takes place.
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.
wait for a mass outbreak on route 207
When the electric boards say there is an outbreak of Pokemon in route 10 that is where you can get one
It is determined by the in game television it will be either Seedot or Surskit.
Seedot is a rare Pokemon that normally can't be found unless there is an outbreak of them on certain route so how do you know when an outbreak occurs? Find a TV in a house and check it every day until Pokemon news airs wait until they tell you there is an outbreak of seedot on route whatever go there to catch seedot.
A "Mass Outbreak" is when many Pokemon show up in a area where they usually not found. Every day go to Dawn's House in Sandgem Town and talk to her little sister, she will tell you what Pokemon and what route for the mass outbreak! Hope This Helps!