So, as far as I can tell, the "red-name" bosses have a two week cool-down win or lose, which is too long. At the moment they more or less 'are' the end game. Yes there is the good ol' grind and find mechanics of pokemon; but that is pretty tame and has been the staple of end game pokemon for generations.
I get that these guys can give crazy good rewards (#NeverLucky) but considering some of them like lance/naero gate content it is realistically too long.
I do agree there should be a cool down though. Just substantially shorter than 2 weeks, perhaps 96 hours similar to the dig spots.
I find that I tend to net 50-60k+ worth of items from digging and since it requires no skill and the bosses require a pretty strong theme'd team and a lot of hours in Dragon's Den I think it is reasonable that these bosses be available frequently since they *tend* to give similar value of rewards... sometimes.... and sometimes they give mystic water.
I would also suggest that "gatekeeper" bosses have a VERY short cool-down on loss (12-24hours, which is plenty of time to level another 100 and EV train it) as you probably don't want players to lose interest because "GARY-DOS CAN'T LAND AN ICE FANG TO SAVE HIS LIFE".
Thanks, really do like the idea of end-game bosses though.