whats the best AI bot system that cna be developed?
An amazing one.
When dealing with AI from a programming perspective: the issue isn't making an AI good, it's making an AI that's terrible and beatable but still feels like the AI is trying.
It takes a lot of effort to, say, make an AI blind and behave like a person with no information when dealing with brush/fog of war/invisibility/smoke clouds.
It takes no effort to make an AI completely ignore those elements and know exactly where everything is all the time. At least if the AI is capable of detecting where enemies are in the first place, you just don't add in any code to prevent them from detecting things under certain circumstances.
Also worth noting programming behavior is actually called Scripting.
Due to computer's capacity to figure out a wide range of mathematical equations with little effort, an AI could also easily achieve perfect CS, dodge everything that they have any chance of dodging, know exactly when to use skills like Flash to dodge something, and make a lot of correct decisions with frame-perfect timing. Also Aim-bots.
With enough time and reviewing pro footage: it would be quite possible to create a LoL AI where no human is realistically capable of beating them.