Psychic‑type and Ground‑type moves are super effective against Poison‑type Pokémon in the mainline Pokémon games.

Type matchups basics

Poison‑type Pokémon take double damage (2×) from Psychic moves such as Psychic, Psyshock, and Zen Headbutt. They also take double damage from Ground moves like Earthquake, Earth Power, and High Horsepower.

Examples of good counters

  • Strong Psychic types (Alakazam, Starmie, Mewtwo) using Psychic‑type attacks can reliably KO many Poison types.
  • Ground types like Golem, Rhydon, Nidoking, and Nidoqueen using powerful Ground‑type moves are also very effective.

Extra notes

  • Poison‑type moves themselves are super effective against Grass and Fairy Pokémon, not against Poison.
  • Steel Pokémon are immune to Poison‑type moves, so using Poison attacks on Steel types does no damage.

Poison weaknesses table

[9][5] [5][7]
Defending type Super effective against it Damage multiplier
Poison Psychic 2× damage from Psychic moves.
Poison Ground 2× damage from Ground moves.

So if you are asking “what is super effective against poison,” the simple answer in Pokémon terms is: use Psychic or Ground moves.

Information gathered from public forums or data available on the internet and portrayed here.