what is effective against poison type

Psychic- and Ground-type attacks are effective against Poison-type Pokémon, dealing super-effective damage.

Quick Scoop: What Is Effective Against Poison Type?

In the mainline Pokémon games (up through the latest gens), Poison-type Pokémon have two main weaknesses:

• Psychic-type moves → super effective (2× damage) vs Poison.
• Ground-type moves → super effective (2× damage) vs Poison.

Common examples trainers use include: Alakazam or other strong Psychic-types using moves like Psychic, and Ground-types like Garchomp or Excadrill using Earthquake or similar Ground moves.

Poison-types, meanwhile, resist Fighting, Bug, Grass, Fairy, and Poison moves, so avoid relying on those when trying to knock them out.

Simple HTML table (effectiveness vs Poison-type Pokémon)

html

<table>
  <thead>
    <tr>
      <th>Move Type</th>
      <th>Effect on Poison-type Pokémon</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Psychic</td>
      <td>Super effective (2× damage)</td>
    </tr>
    <tr>
      <td>Ground</td>
      <td>Super effective (2× damage)</td>
    </tr>
    <tr>
      <td>Fighting</td>
      <td>Not very effective (½×)</td>
    </tr>
    <tr>
      <td>Bug</td>
      <td>Not very effective (½×)</td>
    </tr>
    <tr>
      <td>Grass</td>
      <td>Not very effective (½×)</td>
    </tr>
    <tr>
      <td>Fairy</td>
      <td>Not very effective (½×)</td>
    </tr>
    <tr>
      <td>Poison</td>
      <td>Not very effective (½×)</td>
    </tr>
  </tbody>
</table>

TL;DR: Bring strong Psychic or Ground moves if you want to beat Poison- types reliably.

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