Has it really been that many?
Since Pokémon X and Pokémon Y‘s release last October, roughly 90-million Pokémon have been traded online using the GTS. To commemorate hitting 100-million (which should be soon), Nintendo will be offering a “Fancy Pattern Vivillon” to players through a special distribution event.
No word yet on how or when you’ll be able to add the Fancy Pattern Vivillon to your collection, but Nintendo says to stay tuned. I’m thinking it’ll be similar to how they distributed Torchic at the Pokémon X/Y launch, but only time (and Nintendo) will tell.