A swarm, in Pokemon terminology, is a group of unobtainable, or rare Pokemon in a certain area, in bulk. These groups of Pokemon appear randomly every day. In Pokemon Diamond you can determine the swarm of the day by going to the house south of Rowan's lab in Sandgem town, the girl in there will tell you where the swarm is, and what Pokemon it is consisted of. For Swarms to appear you must already have the National Dex, which is given to you after you have seen every Pokemon in the region, and talk to the Professor.
Nosepass is a swarm Pokemon on Pokemon diamond
Have you talked to the gir every day? The swarm should change. :)
Swarm in Fuego Ironworks
When there is a swarm at Rt. 222
fuego ironworks
you can't find metang in Pokemon diamond you have to get beldum in swarm when you get the national pokedex and then evolve it
Catch a drowzee in a swarm and evolve it
Swarm. Route 230 in the grass.
In Pokemon Diamond and Pearl, Phanpy swarms on Route 207.
they mean a swarm of combees you know like a whole bunch of combees
trade, migrate, cheat, and there may be a swarm, but probly not
You evolve it from Doduo which can be found in a Swarm in Route 201