Question: what is the difference between poison and badly poisoned?
Answer: If a poisoned Pokémon causes an opponent to faint, the poisoned Pokémon will not take damage that turn. ... A badly poisoned Pokémon takes damage equal to 1/16 of its maximum HP (rounded down, but set to 1 HP if it would be less) on the first turn, after which damage increases by 1/16 each time it takes poison damage.