The pokemon that you can only get from using the pokeradar are

Nidorina route 211, lake Valor
Nidoran (Boy) route 201
Nidorino route 221, Lake Valor
Venonat route 229
Mankey routes 225,226
Primape routes 225, 226
slowpoke route 211 (Pearl only)
Grimer Route 215 south
Tauros Route 209, 210 south
Ditto Route 218
sentret route 202
togepi route 230
mareep valley windsworks
Flaffy route 222
Hopip Route 205
Skiploom route 205 North
Sunkern Route 204 North
Wobbufet all three lakes
Houndoom Route 214 (Pearl only)
stantler Route 207 (pearl only)
smeargle route 212 North
Tyrogue Routes 208, 211 west
milktank Route 208, 210 south
Larvitar Route 207 (diamond only)
mightyena route 214, 215 (diamond only)
swellow route 213
Ralts route 203, 204 south
Kirklia route 203, 204 south
nincada ertna forest
Loudred Mt Coronet
aron Fuego ironworks
Torkoal Route 227, Stak Mountain
Trapinch route 228
Vibrava Route 228
Swablu Route 211 East
Baltoy Route 206
Kecleon Route 210 North (diamond only)
Duskull Route 224
Dusklops Route 224
Snorunt Route 216, 217
Bagon 210 North (Pearl Only)
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