Question

Have any Pokemon that were unavailable until Pokebank received Base stat changes?

Comments

http://www.serebii.net/xy/updatedstats.shtml

Pokemon in that link received base stat changes in X and Y.
Ill edit in which Pokemon were unavailable before pokebank, but for now enjoy that list. xD

Hope I helped. :)

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I'm pretty sure all of those are pre-bank...

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They are.

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List is incomplete anyway. Lol. :P

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are you serious, of all the stats azumarill gets a special attack increase ._.

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I love how you're the only one in the whole Database who cares about Base stat changes M00, even though we all REALLY should

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Wow, this is a nice question to bump up the 'annoying question total'! :D

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Azumarill. That's it That's just it.

Answer 1

No.

Every Pokémon that has received a Stat Change in Generation 6 was available in Pokémon X and Y prior to the release of Pokémon Bank.

You'll find the a record of all the Pokémon with Stat Changes in Generation 6 here.

Hope I helped :)