Yeah, it's one of the most difficult forms of 5th gen RNG; you're using the Cgear, so the nature is essentially random, you've got to use a two stage timer (because you've got to hit the correct delay AND the right time, just like gen4) Plus synchronize doesn't work in the entralink, so no increasing the chances of getting the nature you want :/
so yeah, in a nutshell, it's difficult to do, and requires a LOT of patience to pull off.