Could anyone guide me through the process of distributing EVs?
For example, Life Orb (non-modest) Mewtwo can OHKO Zacian with fire blast:
252 SpA Life Orb Mewtwo Fire Blast vs. 4 HP / 0 SpD Zacian-Crowned: 164-195 (97.6 - 116%) -- 87.5% chance to OHKO
First and foremost, should you opt for never OHKO or is a 30% OHKO good enough?
Secondly, when I am adjusting the EVs, I could just put 188 into sp.def and the problem is solved:
252 SpA Life Orb Mewtwo Fire Blast vs. 4 HP / 188 SpD Zacian-Crowned: 140-166 (83.3 - 98.8%) -- guaranteed 2HKO
Whereas, say, I could have 100 HP and 104 sp.def and still tank the same fire blast:
252 SpA Life Orb Mewtwo Fire Blast vs. 100 HP / 104 SpD Zacian-Crowned: 151-179 (83.8 - 99.4%) -- guaranteed 2HKO
However, in the latter, I used up 16 more EVs compared to the former. Despite the fact that I used more, I could now invest less in defense. So is there any rule or theory I could follow to reach the optimal balance for a Pokemon? Because I don't want to try every single spread or else it would be too tedious.