I think he may be referencing Smogon's Random Battle. He may want that to be a tier but have it limited to OU mons.
I just want a random but with more OU pokemon, and for the elaboration, it is for the programmers to think about it, because i think that there is more possibilities to improve the random, so the players can have better experience
Maybe if there was an option for which BF 6v6 tiers would like to be played. Could check off tiers that you don't want to play and leaved checked on tiers that you want to play.