Available at launch with its Mega Stone.
☆ NintendObs Weekly – Monday, August 11, 2014 – Sunday, August 17, 2014.
Shiny Beldum / Terhal Chromatique
Shiny Metagross / Métalosse Chromatique
Shiny Mega Metagross / Méga-Métalosse Chromatique
As a special gift for those who purchase Pokémon Omega Ruby or Pokémon Alpha Sapphire shortly after launch, a special Shiny Beldum holding a Mega Stone will be available! By raising this Beldum, you will be able to evolve it all the way into a Shiny Mega Metagross! This is your chance to get a powerful Mega-Evolved Pokémon right away and in a very rare form!
Source: Pokémon Ruby Sapphire.
Ici en français : Obtenez un Terhal Chromatique ! 😉
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And if you’ve already got yours, click on Pokémon Omega Ruby and Alpha Sapphire for everything you need to know about the games. 😀