the leagues are aparendly not good enoug for higher player because the prefer to stay in the lower leagues for the gems. and they have riddicoules defense i just encounterd 5 fights right one after the other where i had to fight against lv 60 to lv 40 monster and i just have 2 lv 20 monster and 1 lv 27 monster and not common.

First of all, don't jump to conclusions, who says they stay in the lower leagues for gems? 25 gems every (week/month idk) isn't worth staying in low leagues. They stay in low leagues because they don't want to face level 100 monsters. In gold league where I used to be at, there are level 100 monsters all scattered over the place, you simply cannot progress into higher leagues with level 60 monsters.