|Debut:||Expedition to Onix Island!|
|Current location:||In an island near Lacunosa Town|
Onix is a serpentine, snake-like Pokèmon who consists mostly of boulders. Onix usually have a spike made of stone on their heads and are rather rare. Shiny Onix are even rarer.
Shiny Onix are very rare and are considered epic.
None of Onix's moves were shown.