Which is the highest level solo monster in all current supplements released for DnD 4.0? I think that it is Bahamut, but there are too many books which I'm not aware of (and also I have read somewhere that Bahamut is level 36, I don't own the concrete book).
Also which monster is the hardest to beat by average balanced team (nor anti-Orcus, or anti-Tiamat team configuration)?