What exactly classifies a Pokemon as a normal type? Are there pokemon that aren't normal type that you think should be?
Normal-types to me are Pokemon that don't possess any sort of unnatural look to them. They're just that, normal. They don't have huge wings, claws or can breathe fire- something which only remains in legends. They're realistic creatures generally, in my opinion. For example Bibarel is exactly like a beaver in a sense, it builds in dams, does hard work etc. Normal types to me are Pokemon that just don't have that supernatural look or quality to them with a few exceptions.
As for any Pokemon being retyped into normal, I honestly can't think of any at the moment. :p