I live in a touristy-desert-water-forest town that's deserted in winter. It's by a large lake which also happens to be closeby to one of the United State's highest concentration of hydroelectric dams. I'm pretty sure we'd have a pseudo-legendary around here. Maybe Mesprit.
Let's see:
Electric-type
Fresh-water type: so no Wailmer, Sharpeedo, or Tentacool.
Bug-type. Oh God, bug-type.
Rodents and other Normals.
Some grass types, but not a lot.
We have seasonal forest fires, so fire-types in summer.
Come to think of it, we have sturgeons nearby, so Relicanths, maybe.
Teddiursa, Wingull, Murkrow, Meowth, Miltank, and Lillipup would all be around. We also have glaciers, so some ice types too. I think I'll stop there.
Oh, and this is all within about a thirty-mile radius.