Pokémon X and Y

[ME##]

http://www.p4rgaming.com/vivillion-happy-pokemon-company-admits-latent-homosexuality-of-its-games

[bluaki]

http://www.gameinformer.com/b/news/archive/2014/08/06/nab-a-free-poke-ball-pattern-vivillon-to-celebrate-the-pokemon-centers-grand-opening.aspx

Soooo.... are all the free event pokemon from now ongonna be vivillions with different patterns?

These last two events are for Vivillon forms that are otherwise impossible to obtain in any region. The games don't have any more Vivillon forms like this, so we won't get any more new Vivillon events unless they start distributing the forms you can already get.

There is, however, one unobtainable form left for Gen6: AZ's Floette.
Besides that, there are the three unreleased event legendaries: Diancie, Volcanion, Hoopa

Any other events we get will be items, special movesets, version/region-exclusive pokemon, shinies, unremarkable useless events, or repeats of already-distributed pokemon.

It's already announced that the next event, immediately after this one ends, is Heracross (X) and Pinsir (Y), with a separate GameStop event for their mega stones.