I am pretty much always represented by a Nosepass at this point xD I think it does share some aspects with me, like being shy (Hoenn Nosepass are pretty rare and only in one cave!), presumably being sensitive to strong smells, and liking flowers (it shows up near flowers in XY and in the HGSS safari zone).
Other pokesonas I have had in the past are Latios and Suicune - in fact, the username Bluwiikoon comes from a phonetic spelling of Suicune (Suwiikoon). I think, perhaps, these two legendaries are a bit too stoic and cool to be representative of me.
If I were to pick a non-Nosepass fave to represent me... maybe Cyndaquil, since its pokedex entries directly reference it being timid. ;o;