No clue. However early game do get Arsene's cane. Random debuffs are very nice.

Usually you can get a character's best equipment via fighting The Reaper. I think that's only weapons though.

So basically farm him during the flu?

No matter your reason?

(Still reaper does give a crap ton of xp apparently)

Reaper doesnt give weapons in p5
You get the best guns/melee items from executing the max confidant personas.
The best armor is from shady commodities final month washables.

Hmmm i see, i want it to beat the twins, so i need the best one, ok guys, i'll do that.

EXECUTION TIME.