This mighty behemoth went up against Ash's Squirtle and nearly had it on the ropes until Ash had Squirtle use Hydro Pump and ultimately weakened it, making it easier to defeat and earn Ash his second win.
- In the dub Drake made a pun about Onix saying it'll "rock" Ash.
|Tackle||Showdown in Pewter City|
|Bind +||Showdown in Pewter City|
|Dig||Clefairy and the Moon Stone|
|Rock Throw||Who Gets to Keep Togepi|
|Sandstorm||Entei at your Own Risk|
|Slam||A Family That Battles Together Stays Together|
|Iron Tail +||Grating Spaces|
|DragonBreath +||Grating Spaces|
|+ indicates this Pokémon used this move recently.*
- indicates this Pokémon normally can't use this move.