Pokémon X and Pokémon Y

I hope it's over 750, but I think if it was, they'd have said "over 750". Only 52 new pokemon would be slim pickings, especially when you only get,at most, 45 of those in a playthrough (You miss out on the other 2 starters+evolutions, and the other legendary), and that's assuming the other 45 are in both versions (extremely unlikely).

Honestly, at this point, it's not such a bad idea to mix and match regions. Hell, playing SoulSilver recently, I forgot half of the Pokemon in Johto existed since I haven't played Silver in probably 8 to 9 years. It's not such a bad idea to revisit some of them.