Aarune (Japanese: ギリーGirii) is a Secret Base Expert from Hoenn.
Aarune is Hoenn native, being born and raised there. Bullied as a child, he often searched for places to get away and hide, before he stumbled upon a Secret Base. As he grew up, he learnt and studied all about Secret Bases before he became a Secret Base Expert. He now travels the world teaching Trainers all about Secret Bases.
Aarune first appears on Route 111 during one of his classes, where he meets the group and shows them all about Secret Bases.