so I saw this mentioned recently and I'm curious if toughing it out works more like focus sash or focus band in terms of like if it has to be full health when it took the hit or not
When a Pokemon is at a high enough level of Affection (Gen VI - USUM) or Friendship (LGPE - present), it will have a chance of surviving any attack (and confusion damage) that would otherwise KO it. This mechanic is most similar to the Focus Band: the Pokemon will be brought to 1 HP instead of being KOed and it can proc multiple times per battle. Unlike the Focus Sash, the Pokemon doesn't have to be at full HP to "tough it out".
Affection (Bulbapedia)