Crystal Onix Theory : r/pokemonanime

Theory: the crystal Onix from the anime was a water typed Terastallized pokemon : r/pokemon

Pikachu in Pictures Chapter 2: I'm a Poké Watcher, I'm a Poké Watcher – Source Gaming

Crystal Onix Continues To Remain Exclusive To The Pokemon Anime – NintendoSoup

Crystal Onix Theory : r/pokemonanime

Had a go at trying to 3D render the crystal onix from the Pokemon anime, not perfect but I'm content : r/blender

Anime and Manga

Pokémon Anime Retrospective

What WAS Crystal Onix?

The Crystal Onix, Pokémon Wiki

In Pokémon scarlet and violet if you tarastalize onyx into an ice type it would look like the crystal onyx from the anime. : r/MandJTV

What is the relationship between Ash and his rivals in the Pokemon anime? How does it change over time and during different series' arcs? - Quora

How is Ash's Pikachu able to beat stronger opponents? - Quora

Pokemon Extravaganza: Movie 03 (Dub) The Spell of the Unown

Showdown in Pewter City - Pokémon Wiki - Neoseeker