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Characteristics
- Height:
- 8.80
- Weight:
- 210.00
Base stats
Total: 385Combat strengths and weaknesses
Damage multiplier taken by Onix depending on the attacking move's type. ×2 and ×4 are the attacks to avoid.
Resistances - weak attacks
Immunities - no damage taken


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Detailed information
General Overview of Onix
Onix, known in Japanese as Iwark, is a Pokémon of the Rock and Ground type present since the first generation. In the games, it is especially appreciated for its impressive size, decent Speed for a Rock type Pokémon, and its useful defensive role in the early stages of an adventure. With Onix as a central keyword, this page focuses on everything relevant for players as well as card collectors.
Onix has an immediately recognizable design: a giant serpent of rock composed of massive segments. Although it does not have many HP or much Attack at low levels, it offers excellent base Defense, allowing it to hold its own against many opponents early in the game. It appears in many rocky or underground areas and remains an iconic Pokémon across several generations. Players looking for a solid evolution can evolve it into Steelix via trading while holding a Metal Coat.
Useful In-Game Information
In the main versions, Onix is often captured in caves, mountains or rocky areas. Its Pokédex entry classifies it as a Rock Snake Pokémon, with a long and massive silhouette. Despite its impressive appearance, its base Attack is low, which can surprise those who encounter it for the first time. It shines, however, thanks to its very high Defense, practical against physical attacks.
In terms of moves, Onix can learn abilities like Rock Slide, Dig, Earthquake, Rollout or Iron Tail depending on the generation. These moves allow it to perform better against opponents, even if its Attack stat remains limited. Players who want to optimize Onix can invest EVs in Defense and HP, but it remains primarily a support Pokémon in the early game. For more advanced teams, Steelix offers a very interesting upgrade thanks to its dual Steel and Ground type and superior stats.
Evolution and Forms
Onix has no evolution by level. To obtain Steelix, it must be traded while holding a Metal Coat. This evolution transforms the giant rock serpent into an even more robust metallic Pokémon, highly appreciated by strategy fans. Onix has no other forms or regional variants, which simplifies tracking it in a player's Pokédex.
Onix in the Games and Strategies
In classic playthroughs, Onix primarily serves as a defensive tool, allowing it to absorb physical hits and offer tactical support. Its Rock and Ground type gives it good resistances, but also notable weaknesses to Water, Grass, Ice and Fighting. When played well, Onix can contribute a great deal to early-adventure battles, notably thanks to its surprisingly high Speed for a Rock type Pokémon.
In competitive play, Onix is rarely used at high level, but it can find a place in specialized teams or in certain particular formats. Its main quality remains its access to Stealth Rock in some generations, which can influence tactical matches.
Onix and the Pokémon Trading Card Game
For collectors, Onix appears regularly in various Pokémon TCG expansions. There are simple cards for personal collections, as well as some more sought-after versions depending on the series and special editions. Players of beginner decks sometimes use it for its impressive silhouette or to complete a collection centered on Rock type Pokémon. Opinions vary on its power in the card game, but it remains an iconic Pokémon appreciated in many collections.
Whether for filling a Pokédex, expanding a card collection, or simply enjoying an iconic Kanto Pokémon, Onix remains a valued choice. Its simplicity, massive design and evolution into Steelix allow it to maintain a lasting place in the games and collections.

