Gyaradosite[edit]
Gyaradosite is an item required to evolve Gyarados into Gyarados (Mega). It is one of 49 Mega Stones required to evolve certain Pokemon into their "mega" forms.
Acquisition[edit]
Gyaradosite can be acquired in a number of ways. It is an item drop during Sidequests and can be bought from Pokebay or found in a Mystery Box.