>>38469948There is a degree of uncertainty with the other stats. I can't think of a situation where a 100% 2HKO turns into a 100% 1HKO with just +5.
For example take this one
248+ Atk Choice Band Tapu Bulu Horn Leech vs. 0 HP / 0 Def Garchomp in Grassy Terrain: 316-373 (88.5 - 104.4%) -- 31.3% chance to OHKO after Grassy Terrain recovery
Now add +5Atk
248+ Atk Choice Band Tapu Bulu Horn Leech vs. 0 HP / 0 Def Garchomp in Grassy Terrain: 324-382 (90.7 - 107%) -- 43.8% chance to OHKO after Grassy Terrain recovery
It's still not a 100% 1HKO, and it didn't even start as a 100% 2HKO.
Maybe you can find a few matchups where that is the case, but those pushing a mon from balanced to broken? Not a chance.