After looking around the site I have noticed that it stands "Shaking/Bubbling spots" at the most routes, and I wonder what it is?
When you play through Pokemon Black and White, some grass patches are shaking, and if you're surfing, some patches will be bubbling. Most of those patches have an uncommon pokemon in them, such as Drilbur that will later evolve into Excadrill.
It's a spot where a rare pokemon appears. However, you're more likely to find Audino than anything in those spots. Still, it's a good idea to check them out. A good strategy for getting to those spots would be to bring out the strongest pokemon in your party, then spray a repel for a safe path.