Jaw Fossil

Jaw Fossil is a fossil in X and Y that can be used to resurrect Tyrunt.

https://vignette.wikia.nocookie.net/pokemon/images/4/47/Jaw_Fossil.png/revision/latest?cb=20140710061831

The player character can either choose the Jaw Fossil, or the Sail Fossil, from a scientist in Glittering Cave.