>>56356873This anon
>>56356904 is correct.
Friendship and Affection was combined starting with LGPE.
Sword and Shield has a cap just before any affection bonuses kick in, and to get past that point you need to either do Pokemon Camp or feed them friendship-increasing berries. Scarlet and Violet do too.
LGPE and BDSP has no such cap.
BDSP only has them start kicking in at 180 Friendship though, and you can use bitter medicine to keep it low for longer(you should be using them any way, as they are more costeffective).
LGPE has the bonuses start kicking in much earlier and they are impossible to hinder in anyway since the bitter medicine is not in these games.