Directions: Bring a fully maxed furfin and use a negate element. Then, spam unbreakable(enchanted would be better) and bask till furfin reaches 1100+ defence but NOTE:KEEP FURFIN'S HEALTH AT RED AT ALL TIMES IF NOT Nox would use one hit KO moves like Buried Alive) once it reaches that defence level, attack with Enchanted Nature's Poison, Enchanted Toxic then smiley slam.

Tricky part comes when Nox revives into his second form - he would have the skill entrap. Make sure u still spam unbreakable and bask but poison him at the right times(when you are still able to survive from 2 entraps or entrap misses but still maintain furfin's health at red) //furfin died as i accidentally basked its health to orange meter and nox used an OHKO attack.

Nox's final form is easiest to kill. Just spam poison and damage skills to finish it off. Good luck people and thank you Dawson for lending me your account :) !