Ahem. "When the target takes damage from the poison, the damage done will be N x, where N starts at 1 and x is 1/16 of the target's maximum HP (rounded down, but not less than 1). While a Pokémon is badly poisoned, N increases by 1 each time it takes either Toxic." I mean, first turn of being badly poisoned, it takes N=1 multiplied by 1/16 of Pokemon's HP. The N counter increases by 1 every turn, meaning second turn would be 2*1/16, and so an.