Swarms only has one syllable.
swarms of grasshoppers
Swarms - 2005 TV was released on: USA: 11 July 2005
The cast of Ultimate Swarms - 2013 includes: George McGavin as himself
bees
No they do not.
Unfortunately, there are no swarms on HeartGold and SoulSilver, only on Diamond, Pearl and Platinum.
Mega Disasters - 2006 Super Swarms was released on: USA: 6 November 2007
Many insects travel in swarms - including (but not limited to) bees, flies, grass-hoppers, locusts, moths & butterflies.
Animals'
Swarms of locust cause problems for farmers because they eat the crops and this causes them to lose a lot of money.
Dawn's sister only informs you of where the Swarms are at, she has nothing to do with changing them. Swarms are daily swarms so every day they could be different but that's the only way they end up changing - when it passes to a new day.