The Pokemon takes damage equal to 1/8 of its max HP at the end of every turn. Poison- and Steel-type Pokemon are unaffected.

The Pokemon takes increasing poison damage at the end of every turn, starting at 1/16 of the Pokemon’s max HP, then 2/16, then 3/16, and so on. If the Pokemon switches out and reenters battle, the damage restarts at 1/16 of its max HP. Poison- and Steel-type Pokemon are unaffected.