Where are places where Floatzel or Buizel most common in Pokemon Platinum?

Question

I'm trying to chain a shiny Floatzel or Buizel and I was wondering what places are the encounter rate the highest for either of these Pokemon?

Answer 1

The single highest place for either is to find a floatzel in route 222 but only in night. The chance is 40%.
Source: http://bulbapedia.bulbagarden.net/wiki/Sinnoh_Route_222

Answer 2

Valley Windworks is a good place to catch Buizel.
Source: Experience and the Pokemon Platinum Version Game Guide.