Gemologist (ability)

Gemologist is an Ability introduced in Generation VII. It is the signature Ability of Sableye (replacing Stall) and Sabludiam.

In battle
Gemologist allows the Pokemon to know whether or not the opponent has a Gem. If the foe is holding a Gem, a message saying "*Pokemon name* smelled a Gem on the opponent!" will appear. Unlike Frisk, this Ability will also activate when an opponent with a Gem enters the battle instead of only when the Pokemon with Gemologist enters the battle. If the opponent holds no Gem, no message with appear.