I mean the writers are inconsistent so it’s really dependent on the writers and duration of a universe.

Then which joker do?

Zsasz

God I hate his weird not at all there connection to Victor Sage.

Ma'alefa'ak has no redeeming qualities, considering that he had his own race die in fire.

I think the only recurring villains from the Batman Franchise that are Pure Evil are the Joker, Black Mask, Hugo Strange, and Victor Zsasz.

Joker, reverse flash.

Does Lex Luthor count? I'm just asking because the guy sometimes only does things just to piss Superman off, like his fake presidential campaign in Justice League Unlimited.

I’d say not given he’s done things for the good of the people too.

You have the Joker, Brainiac, Darkseid, Mongul, Gorilla Grodd, Eobard Thawne, Black Mask, Black Manta, Superboy-Prime, Anti-Monitor, Doctor Psycho, Victor Zsasz, Felix Faust, Doctor Destiny, Nekron, Krona, Barbatos, Bertron, James Gordon Jr., Commander Blanx, Deacon Blackfire, DeSaad and Ragdoll.

And do let me know if you want to know who's Pure Evil in other media.