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Personally I always really liked Hitmonlee because of how strange and odd he looks. To me that is what a humanoid Pokemon should look like, as opposed to something like Mr Mime which I thought was a much worse design.
To answer your question, I think that most of the Pokemon after Gen 3 don't really look right to me. There are some great ones, but the overall design scheme is just not quite right and doesn't really say "Pokemon" to me.