It's mega stone I think is a new item for rayquaza called the green orb
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Have it hold the Sceptilite, then press "Mega Evolution" during a battle to Mega Evolve it.
No there are no Pokemon that can evolve into Rayquaza since it is a Legendary Pokemon and doesn't have a pre-evolved form.
no it evolves into linoone
you have to use anaction replay.
16, but you have to beat rayquaza to evolve him