They are Pokemon in certain routes that have their appearance percentage raised so there are more of them around.
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Check the TV every day.
You can't....Sorry you can only migrate it from firered i think in emerald or i think there is a day where there is a swarm of pineco.
You (as in the person) don't swarm. Instead, the Pokemon swarm. If you watch TV, sometimes they will announce that a bunch of _____ (a bunch of a certain Pokemon) has been spotted at ______ (a place). That is the swarm Pokemon. Swarm Pokemon are really special. Every day of the week there is a new swarm Pokemon. Catch them all! Hope this helped! =)
You cannot 'swarm' Pokemon. The swarm Pokemon are Pokemon that gather in large numbers to a certain area and appear at an alarmingly high frequency. After beating Red and obtaining the National Pokedex, you can check Professor Oak's talk show for the daily swarm Pokemon.
Certain Pokemon do not swarm at specific times. The game gives you the swarm Pokemon at random. Just check each day until it is Ralts.