Extreme mode on bosses do sound fun, but there'll always be that one player who'll find a bossable team (like always and it'll spread out like wildfire.
The suggestion " Also once in a month, the player with the most wins in extreme mode could get a reward like non tradeable IV lock RR or equal " will cause the top player to have an unfathomable amount of IV lock RRs which of course, isn't good.
Plus, the idea of a ranking system for Bossing of all things, no offense is quite stupid.