Gentle Rodriguez
Member
no. Gen III rebooted the way the game's IVs and EVs worked and you can only go as far back as Gen III. you can still bring Gen III pokes up to the newest games.
If you're a crazy madman like me you can even import your Pokemon all the way from Colleseum and XD if you want.
Colleseum>Ruby>Diamond>Black>X. Seems less of a pain than it actually was.