You didn't ask in Smogon, so I did that for you.
No, but its been suggested.
A lot of us aren't a huge fan of the new revamped cries that were used for older Pokémon Gen 6 and onwards. An option in the settings to revert the cries of Gen 1-5 Pokémon back to the originals would be nice. (Especially since many cries were ruined by this change)
It has been suggested but under progress. As of now it's not possible to use older cries.