Board Thread:Game Discussion/@comment-188.223.30.60-20130601132106/@comment-10299813-20130601154302

As far as I have seen, there are two ways that you can start to get access to the larger bosses. The first is to be high enough point wise that you begin to encounter them on your own, and then the game will keep feeding some to you as part of the request system. I am fairly confident that the second way, and what seemed to happen to you, was that Mobage probably floods the game with higher level bosses the last few hours as the scramble for positioning occurs. Since each player is capped at 6 bosses per time, and the larger bosses generally have a time limit of 20-30 minutes, the request for help system HAS to put help requests out, so it begins to filter lower and lower down the line.

That being said I could be way off base. This was only my third event, and the second event that I REALLY tried for.