- ATTACK (LV 100)
- 41
- CATCH CHANCE
- 17% (Poké Ball)
- EGG STEPS
- 1,000
- BASE EXP
- 77
- GROWTH RATE
- Medium Fast
- CARD RARITY
- rare
- HOME REGION
- Kanto
Forms: 
Crystal Onix
Where to find it
Sevault Canyon Wild · 9.1% of encounters 
Rock Tunnel Dungeon boss (can be caught) Victory Road Dungeon · wild · 8.9% of wild fights Union Cave Dungeon · wild · 10% of wild fights Victory Road Johto Dungeon · wild · 25% of wild fights Evolution
SteelixLevel evolutions happen by themselves when the Pokémon reaches the level: you get the evolved Pokémon and keep the one you had. Stones and other evolution items are used from the bag on a Pokémon you own.
Base stats
HP 35
Attack 45
Defense 160
Sp. Atk 30
Sp. Def 45
Speed 70
Total385
Its attack in the game is worked out from all six stats (see Game mechanics).
Type matchups
How much damage Onix takes from each attacking type (only the ones that aren't ×1).
Takes ×2: icefightinggroundsteel
Takes ×½: normalfireflyingrock
Takes ×¼: poison
Immune: electric
Trading card
Its card in Kanto Set 1 is rare. Owning the card raises Onix's attack: +2% (normal), +5% (gold), +10% (animated), +20% (shiny), and up to +40% once graded by TAPMARK.
Used in battles by
- Leader Brock (Pewter City)
- Elite Four Bruno (Indigo Plateau (Kanto))
- Supreme Gym Leader Drake (Pummelo Island)
- Elite Four Bruno (Indigo Plateau (Johto))
- Hiker Marcos (Mt. Moon)
- Hiker Eric (Rock Tunnel)
- Hiker Oliver (Rock Tunnel)
- Team Rocket Boss Giovanni (Rocket Game Corner)
- Ruin Maniac Lawson (Lost Cave)
- Ruin Maniac Layton (Pattern Bush)
- Ruin Maniac Brandon (Tanoby Ruins)
- Hiker Daniel (Union Cave)