Can I complete the Pokedex with only 6th Generation games?

Researching the answer to this question, I encountered two extremely helpful lists on Serebii.net:

• Pokémon X & Pokémon Y - Unobtainable Pokémon
• Pokémon Omega Ruby & Pokémon Alpha Sapphire - Unobtainable Pokémon

Diligently comparing the two lists, the only Pokémon that appear on both are mythic legendairies such as Mew, Celebi, etc. Even all the generation-2/4/5 legendaries like Suicune, Cresselia, and Landorus (to name one from each) are available in the Gen3 remakes (many are, of course, gated to one version or the other).

So, assuming the lists are accurate (and they appear to be); Yes, the pokédex is complete-able owning only Gen6 games. Keeping in mind that as soon as the PokéBank was released last February, this was already possible through the GTS - I mean, unless you own all four games, some trading is unavoidable due to how Pokémon games are structured.

For Science -

I went ahead and performed an intersection of the unobtainable sets of pokemon in both the game versions from here:

Pokemon XY - http://www.serebii.net/xy/unobtainable.shtml

Pokemon ORAS - http://www.serebii.net/omegarubyalphasapphire/unobtainable.shtml

The list is as follows :

1. #151 - Mew
2. #251 - Celebi (Obtainable as a gift for depositing/withdrawing a pokemon in pokemon bank. Worked even with the trial period.)
3. #385 - Jirachi
4. #489 - Phione
5. #490 - Manaphy
6. #491 - Darkrai
7. #492 - Shaymin
8. #493 - Arceus
9. #494 - Victini
10. #647 - Keldeo
11. #648 - Meloetta
12. #649 - Genesect

Everything else is obtainable from the base games without a requirement to trade in from previous generation games.