Once Diancie is transferred to ORAS, a Diancite will be provide to you at any Pokémon Center.
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Diancie is a Mythical Pokémon that you can get in Pokémon X or Pokémon Y by picking up a special code at participating stores. Once you obtain Diancie, you can bring Diancie over to your copy of Pokémon Omega Ruby or Pokémon Alpha Sapphire. Or use Pokémon Bank to bring Diancie to your copy of Pokémon Omega Ruby and Pokémon Alpha Sapphire. You can then obtain Diancite in the game, and Mega Evolve Diancie into Mega Diancie during battle.
Source: Pokémon Ruby Sapphire.
Ici en français : Récupérez Diancie dans votre partie ! 😉
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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. 😀