I've never heard of any of those in the wild outside of Hitmontop.
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Nope. I think you can't, much like the other pokemon games.
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It is not possible at all, even finding espeon and umbreon in the wild is impossible too
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You can't find those in the wild, it is however possible to find Crobat and Blissey in the wild.
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Anything requiring an item to evolve will not be found in the wild
The aforementioned blissey, crobat, espeon, umbreon and hitmontop do not require items
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Yes, you are right, I should have made my response clearer :)