Scrolling through hundreds of Pokemon in the NU Pokedex can get tedious when you're doing a lot of breeding, especially considering like half of the Pokemon in that section are never actually used outside of Little Cup. It'd be the same principle for why there are no UUs in the OU section etc.   Granted, there is a search bar. I know that you can directly search for a Pokemon that you're looking for, however sometimes I find it useful to flick through the entire list of Pokemon in a ti