Pokémon D/P Swarm Reference

In D/P, after you cleared the game and obtained National Dex, you can go to Prof. Rowan's assistant's house, talk to the girl, and she can tell you locations of Pokémon from prev. versions. It changes every day.

List of Swarm Pokémon:

Route 201

Route 202

Route 203

Route 206

Route 207

Route 208

Route 209

Route 213

Route 214

Route 215

Route 216

Route 217

Route 218

Route 221

Route 222

Route 224

Route 225

Route 226

Route 227

Route 228

Route 229

Route 230

Lake Verity

Lake Valor

Outside Fuego Ironworks

Inside Eterna Forest

Valley Windworks