A jutsu without weakness? Is there any jutsu without any weakness? Itachi said there's a weakness to every jutsu . But come on there has to be atleast one.
As far as we know Itachi was right. There is no jutsu in the Naruto universe that we know of which doesn't have limits that can be used against it. The only thing that could accomplish that would be the combined divine ability of an actual god of that universe but no such thing was ever named. The closest thing we know was Kaguya but even she had her limitations, for example she had to take a physical form that could be sealed.