ORAS is able to battle and trade with SM so long as you don't use any USUM-exclusive features, so it's still Gen 6.
SM has no way whatsoever to battle and trade with XY or ORAS. Therefore, it's Gen 7.
USUM is able to battle and trade with SM so long as you don't use any USUM-exclusive features, so it's still Gen 7.
Considering all the conventions GameFreak's been breaking, the only real way to define a Generation is if the current game can Battle and Trade with the previous installment to any capacity.
>inb4 "I guess that means GSC are Gen 1 games"
No, you dumb fuck, I said Trade AND Battle. GSC can only Trade with RGBY.
