Whether Michael Keaton’s Batman had a Robin depends on which Batman Returns sequel chronology The Flash will consider canon. After redefining Batman for the big screen and helping make the Dark Knight into a movie star, Michael Keaton returns as Batman for The Flash in a movie that will visit the “Burtonverse.” The Flash's trailer even suggests that it was the DC Universe Barry Allen who created Keaton’s Batman universe, which would be a significant retcon. Still, by revisiting Keaton’s Batman timeline, The Flash can settle some old canon questions regarding the Tim Burton Batman movies and Batman’s ‘90s anthology series as a whole.

https://screenrant.com/did-michael-keatons-batman-have-a-robin/