Pokémon Battles are something different to a literal fight to the death, they're a more standardised and safe way for Pokémon to fight. In a properly done Pokémon Battle, no matter the difference between the ones involved, no Pokémon will die or get any permanent injury at all, at worse simply "Fainting" which can easily be recovered from at it's merely just not being in good enough condition to fight. In most other games and notably other RPGs this is also sort of there but instead just one of "those video game things" that you are not meant to think about and what actually happens to a character as a result of a battle is dependant on other factors like the story, lore, context and simply what the creators want. For Pokémon Battles in Pokémon, they turned this thing that's normally just one of "those video game things" into something that's an intentional and important part of the series with a very specific implementation. That means that when a Level 1 newly hatched weak Pokémon merely Faints from Level 100 Necrozma using Light That Burns the Sky, that it is canon that Level 1 merely Fainted from it, how exactly that's the case is up for debate but the fact is that Pokémon only Faints at worst.
>>58017255 (OP)>How exactly does nurse joy fix this?In the games the Pokémon while in their ball just gets put in some machine that fully heals them in seconds. In the anime it's a more involved and gradual process.