Pokémon-specific weakness guide

Onix Weaknesses and Counters

This guide explains Onix's defensive profile, including every weakness, resistance, immunity, and practical counter type based on its Rock / Ground typing.

Rock Ground

Onix

#0095

Weaknesses (6)

Water×4 Grass×4 Ice×2 Fighting×2 Ground×2 Steel×2

Resistances (5)

Poison×0.25 Normal×0.5 Fire×0.5 Flying×0.5 Rock×0.5

Immunities (1)

Electric×0

Battle notes

Onix's Rock / Ground typing is best attacked with Water (4x), Grass (4x), Ice (2x). Start with those attacking types when choosing moves or counter Pokémon.
Avoid relying on common Electric, Poison, Normal, Fire attacks unless they have unusually high power or a secondary purpose, because Onix resists or ignores those matchups.
This guide uses the modern Gen 6+ type chart only. Abilities, held items, Terastallization, weather, fields, and special move rules can still change real battle outcomes.

Best counter types

These attacking types hit the defender for super-effective damage under the modern Gen 6+ type chart.

Water×4 Grass×4 Ice×2 Fighting×2 Ground×2 Steel×2

Example Pokémon with Effective Types

These are examples of Pokémon associated with super-effective attacking types, not a ranked competitive counter list.

Defensive typing summary

Onix's base defensive typing is Rock / Ground. The weakness chart multiplies both types when a Pokémon has two types, so a matchup can become 4x, 2x, 1x, 0.5x, 0.25x, or 0x.

FAQ

What is Onix weak to?

Onix is weak to Water (4x), Grass (4x), Ice (2x), Fighting (2x), Ground (2x), Steel (2x).

Which attacking types are most practical against Onix?

Water and Grass are tied as the strongest attacking types against Onix, each dealing 4x damage.

Does Onix's ability change these weaknesses?

This page uses base defensive typing only. Abilities, held items, Terastallization, weather, fields, and special move rules can change actual battle outcomes.