As part of its ongoing efforts to promote every single Pokémon out there, The Pokémon Company has shared special content dedicated to Rayquaza:
Did you know? Rayquaza is said to have lived for hundreds of millions of years. Legends remain of how it put to rest the clash between Kyogre and Groudon. It flies forever through the ozone layer, consuming meteoroids for sustenance. The many meteoroids in its body provide the energy it needs to Mega Evolve.
Source: @Pokemon
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