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Heart Gold and Soul Silver: Swarms
Swarms are when a Pokemon is found in a specific area for a short period of time (one day). To find out what Pokemon is currently swarming in your game listen to Professor Oak's radio show with your PokeGear.
Swarming Pokemon:
Chansey
Route 13
Ditto
Route 47
Marill
Mt. Mortar
Yanma
Route 35
Dunsparce
Dark Cave
Snubbull
Route 38
Qwilfish
Route 32
Remoraid
Route 44
Poochyena
Route 1
Wingull
Vermilion City
Ralts
Route 34
Sableye
Heart Gold Only
Route 9
Mawile
Soul Silver Only
Route 9
Gulpin
Soul Silver Only
Route 3
Swablu
Route 45
Whiscash
Violet City
Baltoy
Heart Gold Only
Route 3
Clamperl
Route 19
Relicanth
Route 12
Luvdisc
Route 27
Kricketot
Viridian Forest
Buneary
Route 25