There have been at least two attempts (that I know of) to create a competitive (6v6 singles) battling AI, although they were a few years ago and relatively prim

There have been at least two attempts (that I know of) to create a competitive (6v6 singles) battling AI, although they were a few years ago and relatively primitive by modern standards. I expect that the relatively limited official support for competitive play would make Pokemon less appealing to the types of institution doing AI research, so you're limited to what a handful of amateurs can do.