Spheal (Peak, block-based) Sealeo (Mountain, block-based) Lapras (Rocky Beach)
... and that's it. Not a lot of variety here.
Johto Safari Zone (Bulbapedia)
You can, and tons more pokemon. Here are all the pokemon you can get in the safari zone.
http://www.serebii.net/heartgoldsoulsilver/safarizone.shtml
