Poison

Poison moves are ×2 against Grass and Fairy; Poison Pokémon resist Bug, Fairy, Fighting, Grass and Poison, and are weak to Ground and Psychic.

Look up the type matchup matrix View defense in the matrix

Two-way summary

When attacking

×2 Increased (×2): Grass
Fairy
×½ Reduced (×½): Poison
Ground
Rock
Ghost
×0 Immune (×0): Steel
×1 Neutral (×1): 11 neutral types — open the full table below

When defending

×2 Increased (×2): Ground
Psychic
×½ Reduced (×½): Grass
Fighting
Poison
Bug
Fairy
×1 Neutral (×1): 11 neutral types — open the full table below

These multipliers describe how a move interacts with the defending type in the current reference chart; they are not final damage and have not been verified for Pokémon Champions.

×2 Increased (×2)
×1 Neutral (×1)
×½ Reduced (×½)
×0 Immune (×0)

How does adding Poison change things?

moves

Inteleon

Inteleon

Water

Multiplier on Water: ×1
Result: ×1

Toxapex

Toxapex

Multiplier on Poison: ×½
Multiplier on Water: ×1
Result: ×½