S8 did not make a mistake in setting it for six days...they just made it really hard to achieve if you don't have crystal or gem animals. I have used every high level animal I have for the past two days to try and defeat the Quartz Quetzalcoatl and no luck. This is very frustrating...almost to the point of removing the game from my phone. I don't know if I am stupid, a glutton for punishment or just too darn stubborn to quit, but I will continue...maybe someday I will actually breed one of these gem/crystal animals and maybe then I will actually stand a chance of defeating these higher level animals. I guess I will keep plugging along...definitely too stubborn to quit!!