Is Onix Good in Yellow Playthrough?
Brock uses two of these in Yellow, and they're the reason your first gym is so hard. As a team member though, Onix's own Attack is lower than most unevolved Pokemon. Massive Defense, zero offensive output. The gap between how Onix looks and how it performs is the widest in the game.
Brock's typing presses Onix's defenses.
Misty's team hits Onix's weaknesses hard.
Onix has the type edge here and should clean up Lt. Surge's team.
Erika's team hits Onix's weaknesses hard.
Onix has the type edge here and should clean up Koga's team.
Onix trades roughly evenly with Sabrina's team.
Onix has the type edge here and should clean up Blaine's team.
Onix trades roughly evenly with Giovanni's team.
Onix trades roughly evenly with Lorelei's team.
Onix trades roughly evenly with Bruno's team.
Onix has the type edge here and should clean up Agatha's team.
Onix trades roughly evenly with Lance's team.
Onix trades roughly evenly with Blue's team.
Catchable
Catch Onix in Rock Tunnel (walking, Lv 14-22, uncommon).
Recommended Moves
- After Brock
- TM28GroundDigPower 150Accuracy 100%PP 10Returned by the Team Rocket Grunt in Cerulean City after you defeat him
- After Misty
- TM08NormalBody SlamPower 85Accuracy 100%PP 15S.S. Anne
- After Lt. Surge
- TM48RockRock SlidePower 113Accuracy 90%PP 10Celadon Department Store roof
- TM10NormalDouble-EdgePower 100Accuracy 100%PP 15Rocket Hideout
- After Erika
- TM40NormalSkull BashPower 100Accuracy 100%PP 15Safari Zone
- After Giovanni
- TM47NormalExplosionPower 170Accuracy 100%PP 5Victory Road 3F
Yellow Onix Locations
Onix winds through a couple of caves, uncommon, with a wild level spread from 14 to 49. Where you meet it decides how big it already is.
2 locations to catch Onix
Encountered via tall grass encounters
Badge 3
Badge 4
Badge 5
Badge 6
Badge 7
Badge 8Best Locations to Catch Onix in Yellow
4 walking spots from Lv. 14-49 for Onix. Sorted by game progression with rates on each row, so you can compare without scrolling through everything.
Onix Weakness
Onix's Rock/Ground typing leaves it vulnerable to Water, Grass, Ice, Fighting, and Ground. Water and Grass hits land at 4x, so they're the biggest threat. It shrugs off Electric-type attacks completely. The Rock/Ground typing picks up 5 resistances to work with. Onix's physical bulk (base 160 Def) helps cushion physical weakness hits, but special attackers are the bigger threat.
| Damage | Types |
|---|---|
| 4x (Critical) | Water, Grass |
| 2x (Weak) | Ice, Fighting, Ground |
| 0.5x (Resist) | Normal, Fire, Flying, Rock |
| 0.25x (Resist) | Poison |
| 0x (Immune) | Electric |
- Only 15 types exist — Dark, Steel, and Fairy are absent
- Ghost has no effect on Psychic (a known bug, fixed in Gen II)
- Special stat governs both offense and defense — no Sp.Atk / Sp.Def split
What is Onix Weak Against
FragileBest Pokemon Against Onix
 Vaporeon Water | B | |
Obtain MethodEvolve Eevee (Celadon City Gift) Available Moves Moves
Damage vs Onix View Vaporeon builds →Bubble Beam 4x332-392%KO Ice Beam 2x160-189%KO | ||
 Vileplume GrassPoison | C | |
 Sandslash Ground | C | |
Available Moves Moves
Damage vs Onix View Sandslash builds →Dig 2x71-83% Submission 2x39-47% | ||
 Gyarados Water | B | |
Obtain MethodEvolve Magikarp (Route 4 Gift) Available Moves Moves
Damage vs Onix View Gyarados builds →Bubble Beam 4x213-250%KO Ice Beam 2x101-119%KO | ||
 Victreebel GrassPoison | C | |
 Marowak Ground | C | |
Available Moves Moves
Damage vs Onix View Marowak builds →Dig 2x60-71% Bubble Beam 4x122-144%KO Submission 2x32-39% Ice Beam 2x89-106%KO | ||
 Wartortle Water | C | |
Obtain MethodEvolve Squirtle (Vermilion City Gift) Available Moves Moves
Damage vs Onix View Wartortle builds →Bubble Beam 4x219-258%KO Dig 2x35-42% Ice Beam 2x106-125%KO Submission 2x28-33% | ||
 Graveler RockGround | C | |
Available Moves Moves
Damage vs Onix View Graveler builds →Dig 2x71-83% Submission 2x38-44% | ||
 Ivysaur GrassPoison | C | |
Obtain MethodEvolve Bulbasaur (Cerulean City Gift) | ||
 Machoke Fighting | C | |
Available Moves Moves
Damage vs Onix View Machoke builds →Dig 2x47-56% Submission 2x60-71% | ||
 Primeape Fighting | C | |
Available Moves Moves
Damage vs Onix View Primeape builds →Dig 2x49-58% Submission 2x60-71% | ||
 Dugtrio Ground | B | |
 Nidoqueen PoisonGround | C | |
Available Moves Moves
Damage vs Onix View Nidoqueen builds →Bubble Beam 4x165-194%KO Ice Beam 2x119-142%KO Submission 2x38-44% | ||
 Nidoking PoisonGround | C | |
Available Moves Moves
Damage vs Onix View Nidoking builds →Bubble Beam 4x179-211%KO Ice Beam 2x132-156%KO Submission 2x39-47% | ||
Onix Evolutions
Onix is a standalone Rock/Ground type at 370 total. It can't breed, which makes catching one the only real option. View every chain in the Evolution Chart.
How to Evolve
Y Onix Best Moveset
160 Defense looks imposing on paper, and then 35 Special turns every MoveSurf, MoveBlizzard, and MovePsychic into a one-hit KO. 45 Attack can't power MoveEarthquake at competitive levels. Blocks physical hits from one side and folds completely from the other.
Best Build
Utility Moveset
- Explosion
- Bind
- Earthquake
- Rock Slide
Recommended Teammates
Moves List
The level-up pool is slim, so TMs matter here. Onix's Normal coverage all comes from technical machines, built on top of Earthquake and Dig for same-type damage. Double-Edge and Earthquake are the payoff moves.
How to Read the Moves Table
Tabs
- Level-Up
- Learned by leveling up.
- TM
- Taught by a Technical Machine.
- Tutor
- NPC tutor (cost: items, BP, money).
- Reminder
- An NPC reteaches any move this Pokemon could have learned by leveling up.
- Transfer
- Carried over from an older game using Pokemon HOME.
- Event
- Given out through Mystery Gift events.
Visual Signals
CAT (Category)
How the move deals damage and which stats it uses.
A small dot on the icon's corner marks the move as contact.
Tier (S to D)
Each move's competitive rank in RankedBoost's system. TM and Tutor sort by tier by default (best first). On Level-Up, click the Tier header to do the same.
PWR (Power)
Base damage. Numbers shown in a type color include STAB (base × 1.5). Hover any colored number to see the math.
— means no power (status moves) or variable power.
Sorting & Filter
Click any column header to sort. Level-Up opens with Lv 1 at the top. TM and Tutor open with the highest-tier moves at the top.
Search filters by move name or type. The Filter button limits the list to STAB, Physical, Special, or Status moves.
Level-Up Moves
TM Moves
All 18 TMs are obtainable before the Elite Four
Tutor Moves
Base Stats
Burrows at high speed in search of food. The tunnels it leaves are used as homes by DIGLETTs.
Onix Yellow Guide
In Yellow, Onix has 370 BST, so weigh it against what your team already covers.
In Yellow, use Onix as a balanced. Physical side carries the damage. Speed is middling, Earthquake is the primary attack.
Game Availability
Present since Red & Blue, Onix appears in 21 games spanning 9 generations. Gen 1 originals like Onix have the longest track record of availability in the series.
Click a game to view version-specific details
- Gen 1RBDebut
Red & Blue - Gen 1Y
Yellow - Gen 2GS
Gold & Silver - Gen 2C
Crystal - Gen 3RS
Ruby & Sapphire - Gen 3E
Emerald - Gen 3FRLG
FireRed & LeafGreen - Gen 4DP
Diamond & Pearl - Gen 4Pt
Platinum - Gen 4HGSS
HeartGold & SoulSilver - Gen 5BW
Black & White - Gen 5B2W2
Black 2 & White 2 - Gen 6XY
X & Y - Gen 6ORAS
Omega Ruby & Alpha Sapphire - Gen 7SM
Sun & Moon - Gen 7USUM
Ultra Sun & Ultra Moon - Gen 7Let's Go
Let's Go Pikachu & Eevee - Gen 8SwSh
Sword & Shield - Gen 8BDSP
Brilliant Diamond & Shining Pearl - Gen 8PLA
Legends: Arceus - Gen 9SV
Scarlet & Violet - Gen 9LZA
Legends: Z-A - Gen 10WW
Winds & Waves
Explore
Where to go next after Onix.
Keep playing · YellowYellow Tier ListThe best Pokemon ranked tier by tierSee Yellow Tier List