Ability₁₇₀-Poison Heal (ft. Poison Counter)

If the Pokémon is poisoned or badly poisoned, it will gain ⅛ of its Max HP at the end of each turn instead of taking damage.
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⚠️When a Pokémon with Poison Heal is badly poisoned, this has no effect on the Pokémon's HP recovery.
⚠️However, the bad poison counter still increases each turn even if the Pokémon has Poison Heal.
📑Example:
⚠️If Gastro Acid (or the Ability is removed) is used on the Pokémon with Poison Heal after being badly poisoned for 5 turns, it will incur poison damage starting at ⁵⁄₁₆ (instead of ¹⁄₁₆).
⚠️If a poisoned Pokémon with Poison Heal is affected by Heal Block/Psychic Noise, it will be neither healed nor damaged by the poison.
~Bulbapedia