I like the concept of this episode. Though catching a Crystal Onix would be cool.
This was an interesting episode. It was nice to see something so different, but it does make you think that there could be many variations of Pokémon in the Pokémon world. So it would be nice to see more of these unusual Pokémon.
The crystal Onix battle scene was interesting especially how water type attacks were useless against the Onix's skin.
It made me mad that the Mateo dude didn't catch the Onix though it was such an anticlimax.