Is the only gen where you can catch them all within the 2 versions without trading from previous games?
Yes. Although between XY and ORAS you can nab all of em.
There is no game where you can catch them all without trading, because starters
You can do that with X/Y and ORAS.
Granted that's two pairs, but they're from the same generation.
>>27253517
>without trading from previous games
>>27253517
Read OP again boy