Swarms

Swarms make a return in Pokémon Brilliant Diamond & Shining Pearl. When you have obtained the National Pokédex, speak to Dawn/Lucas in Sandgem Town and they'll recommend talking to their sister. If you do, then she will tell you she saw that a swarm of Pokémon was happening.

These Pokémon are all outside the Sinnoh Pokédex and can only be found here or the Grand Underground. The Pokémon that spawns changes each day.

After the first swarm is told to you by Dawn/Lucas' sister, you will be able to see what the Swarm is through the pause menu in the game which will lead you to the map. When you go into the area which has the Swarm, the Pokémon will rapidly pop out of the overworld grass and can be interacted with there.

Swarms

List of Swarm Pokémon

Pidgey
Known Locations:
Route 229
Magnemite
Known Locations:
Fuego Ironworks
Farfetch'd
Known Locations:
Route 221
Doduo
Known Locations:
Route 201
Drowzee
Known Locations:
Route 215
Krabby
Known Locations:
Route 226
Voltorb
Known Locations:
Route 218
Cubone
Known Locations:
Route 203
Lickitung
Known Locations:
Lake Valor
Natu
Known Locations:
Route 224
Dunsparce
Known Locations:
Route 208
Snubbull
Known Locations:
Route 209
Swinub
Known Locations:
Route 217
Corsola
Known Locations:
Route 230
Delibird
Known Locations:
Route 216
Phanpy
Known Locations:
Route 207
Smoochum
Known Locations:
Lake Acuity
Zigzagoon
Known Locations:
Route 202
Surskit
Known Locations:
Lake Verity
Slakoth
Known Locations:
Eterna Forest
Makuhita
Known Locations:
Route 225
Nosepass
Known Locations:
Route 206
Skitty
Known Locations:
Route 222
Electrike
Known Locations:
Valley Windworks
Spoink
Known Locations:
Route 214
Spinda
Known Locations:
Route 227
Absol
Known Locations:
Route 213
Beldum
Known Locations:
Route 228