Well, Larvesta's a fire and bug type. If you have any Pokemon it's weak to, such as water, flying, or especially rock, that might have been what frightened it of.

[Twilight tosses out a pokeball and her own Larvesta shows up. She pats it on the head as it stretches itself up to peer into the gear.]

If you'd like, I could try to have Pyrolepi here talk to it.