Made a chart a while ago for my team page and my gf basically took it from F tier to A class.

Since I know people are going to nit-pick, I understand that other Pokemon can be used to fight Blissey and other movesets are serviceable. I just featured some key mons and their most ideal sets here.

If you want a more wide/detailed break down on breaking down Blissey, check our u/Dondon151‘s graphic here and his write up on Gamepress.

I hope my graphic helps players beat down this pink monstrosity more efficiently!