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>Rock Type
>In the entrance there's a floating gray gem that takes the trainer to a plataform on the other side of the gym where he must face a trainer. After that, the trainer will ask him something like "What's the color of Alolan Persian's gem?" and the trainer will be presented with three different colored gems and must step on one of them. If you always choose the correct ones, you only have to battle three trainers before facing the gym leader. All questions are about the colors of Pokemon.
>Second Gym in the region. Aron, Sableye and Boldore
>Post Elite Four Team. Cradily, Archeops, Barbaracle, Aggron, Sableye and Gigalith.
>Pic related, didn't think of a name
>Rock Polish
>Gym Leader is a precious gem collector/afficionado. After beating the Elite Four, you can challenge him once a week with a mono team of his choosing to get a type gem of that particular type.