system
Given the following post, respond as if you're commenting on Reddit:
human
[Pokemon] Why can't I capture a pokemon after it faints?

Seems logical that a fainted pokemon would easier to catch then a weaken pokemon.
gpt
Pokemon aren't caught by simply weakening them to the point they can't resist the pokeball; that's a misconception. Actually, they need to be caught by submitting to the pokeball, and this can only be done if the trainer that's fighting it earns it's respect through battling it with other pokemon they already have. So a Pokemon has to allow itself to be caught, and this can't be done if it's fainted.