Pokémon - Blastoise is too angry to faint

Oh shit, let me get the DOOM music

Does that happen if a pokémon's affection is too low? And while on that, why Buneary of all things starts with zero'd affection? (most mons start at 70 out of a 255 max)

Also gotta like the current trend of trahsmons becoming viable by literally dying and too angry to stay dead (Basculin, Primeape) or rejecting the weakness of flesh (Delibird).