Question: can you transfer pokemon back to oras from sun and moon?
Answer: Sun and Moon players are still able to obtain a Mewnium Z crystal. And because Pokémon Omega Ruby and Alpha Sapphire are recent games you'll be able to trade back and forth between ORAS, Sun and Moon and Pokémon Bank. Older games like Pokémon Red, Blue and Yellow and Black and White only allow one-way transfers.