Djinn is an Air-elemental Phantom, which means Earth attacks are effective against it. It uses two moves: Lightning Bolt, which is a single target Air-elemental attack, and the more dangerous Thunderburst Lv. 3 which targets multiple parts of Ashley's body.
A good strategy is to cast Soil Fusion or equip a Gnome Emerald to self or weaponry, and equip the Djinn Amber to shield. Also, Phantoms are more susceptible to Blunt-type weapons, so use that as well.
[view·edit·purge]The jinn, also spelled djinn, or genies, are spirits mentioned in the Qurʾān and Islamic theology who inhabit an unseen world in dimensions beyond the visible universe of humans. Together, the jinn, humans and angels make up the three sentient creations of God.