>>52932166after a bit of experimenting I've found these numbers to be a pretty consistent "bare minimum" for the OHKO, however things like higher/lower SpDef pokemon influence things quite a bit, especially when the tera is NVE. The ones that are red are possible, but not usually guaranteed, so I add an attack cheer somewhere in the turn order just to hedge my bets if it's possible.
I've considered making a better looking chart, but graphic design is not my passion
